Merge branch 'master' into custom_odb

Conflicts:
	odb.go
	wrapper.c

31 files changed, 2423 insertions, 216 deletions

diff --git a/.travis.yml b/.travis.yml
new file mode 100644
index 0000000..2a03529
--- /dev/null
+++ b/.travis.yml
@@ -0,0 +1,11 @@
+language: go
+
+go:
+  - 1.0
+  - 1.1
+  - tip
+
+install:
+  - script/build-libgit2.sh
+  - export PKG_CONFIG_PATH=$PWD/libgit2/install/lib/pkgconfig
+  - export LD_LIBRARY_PATH=$PWD/libgit2/install/lib
diff --git a/blob.go b/blob.go
index b638c4f..4277127 100644
--- a/blob.go
+++ b/blob.go
@@ -3,23 +3,85 @@ package git
 /*
 #include <git2.h>
 #include <git2/errors.h>
+#include <string.h>
+
+extern int _go_git_blob_create_fromchunks(git_oid *id,
+	git_repository *repo,
+	const char *hintpath,
+	void *payload);
+
 */
 import "C"
 import (
+	"io"
+	"runtime"
 	"unsafe"
 )
 
 type Blob struct {
 	gitObject
+	cast_ptr *C.git_blob
 }
 
-func (v Blob) Size() int64 {
-	return int64(C.git_blob_rawsize(v.ptr))
+func (v *Blob) Size() int64 {
+	return int64(C.git_blob_rawsize(v.cast_ptr))
 }
 
-func (v Blob) Contents() []byte {
-	size := C.int(C.git_blob_rawsize(v.ptr))
-	buffer := unsafe.Pointer(C.git_blob_rawcontent(v.ptr))
+func (v *Blob) Contents() []byte {
+	size := C.int(C.git_blob_rawsize(v.cast_ptr))
+	buffer := unsafe.Pointer(C.git_blob_rawcontent(v.cast_ptr))
 	return C.GoBytes(buffer, size)
 }
 
+func (repo *Repository) CreateBlobFromBuffer(data []byte) (*Oid, error) {
+	runtime.LockOSThread()
+	defer runtime.UnlockOSThread()
+	oid := C.git_oid{}
+	ecode := C.git_blob_create_frombuffer(&oid, repo.ptr, unsafe.Pointer(&data[0]), C.size_t(len(data)))
+	if ecode < 0 {
+		return nil, MakeGitError(ecode)
+	}
+	return newOidFromC(&oid), nil
+}
+
+type BlobChunkCallback func(maxLen int) ([]byte, error)
+
+type BlobCallbackData struct {
+	Callback BlobChunkCallback
+	Error    error
+}
+
+//export blobChunkCb
+func blobChunkCb(buffer *C.char, maxLen C.size_t, payload unsafe.Pointer) int {
+	data := (*BlobCallbackData)(payload)
+	goBuf, err := data.Callback(int(maxLen))
+	if err == io.EOF {
+		return 0
+	} else if err != nil {
+		data.Error = err
+		return -1
+	}
+	C.memcpy(unsafe.Pointer(buffer), unsafe.Pointer(&goBuf[0]), C.size_t(len(goBuf)))
+	return len(goBuf)
+}
+
+func (repo *Repository) CreateBlobFromChunks(hintPath string, callback BlobChunkCallback) (*Oid, error) {
+	runtime.LockOSThread()
+	defer runtime.UnlockOSThread()
+
+	var chintPath *C.char = nil
+	if len(hintPath) > 0 {
+		C.CString(hintPath)
+		defer C.free(unsafe.Pointer(chintPath))
+	}
+	oid := C.git_oid{}
+	payload := &BlobCallbackData{Callback: callback}
+	ecode := C._go_git_blob_create_fromchunks(&oid, repo.ptr, chintPath, unsafe.Pointer(payload))
+	if payload.Error != nil {
+		return nil, payload.Error
+	}
+	if ecode < 0 {
+		return nil, MakeGitError(ecode)
+	}
+	return newOidFromC(&oid), nil
+}
diff --git a/branch.go b/branch.go
new file mode 100644
index 0000000..bd7312b
--- /dev/null
+++ b/branch.go
@@ -0,0 +1,193 @@
+package git
+
+/*
+#cgo pkg-config: libgit2
+#include <git2.h>
+#include <git2/errors.h>
+*/
+import "C"
+
+import (
+	"runtime"
+	"unsafe"
+)
+
+type BranchType uint
+
+const (
+	BranchLocal  BranchType = C.GIT_BRANCH_LOCAL
+	BranchRemote            = C.GIT_BRANCH_REMOTE
+)
+
+type Branch struct {
+	Reference
+}
+
+func (repo *Repository) CreateBranch(branchName string, target *Commit, force bool, signature *Signature, msg string) (*Reference, error) {
+
+	ref := new(Reference)
+	cBranchName := C.CString(branchName)
+	cForce := cbool(force)
+
+	cSignature := signature.toC()
+	defer C.git_signature_free(cSignature)
+
+	var cmsg *C.char
+	if msg == "" {
+		cmsg = nil
+	} else {
+		cmsg = C.CString(msg)
+		defer C.free(unsafe.Pointer(cmsg))
+	}
+
+	runtime.LockOSThread()
+	defer runtime.UnlockOSThread()
+
+	ret := C.git_branch_create(&ref.ptr, repo.ptr, cBranchName, target.cast_ptr, cForce, cSignature, cmsg)
+	if ret < 0 {
+		return nil, MakeGitError(ret)
+	}
+	return ref, nil
+}
+
+func (b *Branch) Delete() error {
+
+	runtime.LockOSThread()
+	defer runtime.UnlockOSThread()
+	ret := C.git_branch_delete(b.ptr)
+	if ret < 0 {
+		return MakeGitError(ret)
+	}
+	return nil
+}
+
+func (b *Branch) Move(newBranchName string, force bool, signature *Signature, msg string) (*Branch, error) {
+	newBranch := new(Branch)
+	cNewBranchName := C.CString(newBranchName)
+	cForce := cbool(force)
+
+	cSignature := signature.toC()
+	defer C.git_signature_free(cSignature)
+
+	var cmsg *C.char
+	if msg == "" {
+		cmsg = nil
+	} else {
+		cmsg = C.CString(msg)
+		defer C.free(unsafe.Pointer(cmsg))
+	}
+
+	runtime.LockOSThread()
+	defer runtime.UnlockOSThread()
+
+	ret := C.git_branch_move(&newBranch.ptr, b.ptr, cNewBranchName, cForce, cSignature, cmsg)
+	if ret < 0 {
+		return nil, MakeGitError(ret)
+	}
+	return newBranch, nil
+}
+
+func (b *Branch) IsHead() (bool, error) {
+
+	runtime.LockOSThread()
+	defer runtime.UnlockOSThread()
+
+	ret := C.git_branch_is_head(b.ptr)
+	switch ret {
+	case 1:
+		return true, nil
+	case 0:
+		return false, nil
+	}
+	return false, MakeGitError(ret)
+
+}
+
+func (repo *Repository) LookupBranch(branchName string, bt BranchType) (*Branch, error) {
+	branch := new(Branch)
+	cName := C.CString(branchName)
+
+	runtime.LockOSThread()
+	defer runtime.UnlockOSThread()
+
+	ret := C.git_branch_lookup(&branch.ptr, repo.ptr, cName, C.git_branch_t(bt))
+	if ret < 0 {
+		return nil, MakeGitError(ret)
+	}
+	return branch, nil
+}
+
+func (b *Branch) Name() (string, error) {
+	var cName *C.char
+	defer C.free(unsafe.Pointer(cName))
+
+	runtime.LockOSThread()
+	defer runtime.UnlockOSThread()
+
+	ret := C.git_branch_name(&cName, b.ptr)
+	if ret < 0 {
+		return "", MakeGitError(ret)
+	}
+
+	return C.GoString(cName), nil
+}
+
+func (repo *Repository) RemoteName(canonicalBranchName string) (string, error) {
+	cName := C.CString(canonicalBranchName)
+
+	nameBuf := C.git_buf{}
+
+	runtime.LockOSThread()
+	defer runtime.UnlockOSThread()
+
+	ret := C.git_branch_remote_name(&nameBuf, repo.ptr, cName)
+	if ret < 0 {
+		return "", MakeGitError(ret)
+	}
+	defer C.git_buf_free(&nameBuf)
+
+	return C.GoString(nameBuf.ptr), nil
+}
+
+func (b *Branch) SetUpstream(upstreamName string) error {
+	cName := C.CString(upstreamName)
+
+	runtime.LockOSThread()
+	defer runtime.UnlockOSThread()
+
+	ret := C.git_branch_set_upstream(b.ptr, cName)
+	if ret < 0 {
+		return MakeGitError(ret)
+	}
+	return nil
+}
+
+func (b *Branch) Upstream() (*Branch, error) {
+	upstream := new(Branch)
+
+	runtime.LockOSThread()
+	defer runtime.UnlockOSThread()
+
+	ret := C.git_branch_upstream(&upstream.ptr, b.ptr)
+	if ret < 0 {
+		return nil, MakeGitError(ret)
+	}
+	return upstream, nil
+}
+
+func (repo *Repository) UpstreamName(canonicalBranchName string) (string, error) {
+	cName := C.CString(canonicalBranchName)
+
+	nameBuf := C.git_buf{}
+
+	runtime.LockOSThread()
+	defer runtime.UnlockOSThread()
+
+	ret := C.git_branch_upstream_name(&nameBuf, repo.ptr, cName)
+	if ret < 0 {
+		return "", MakeGitError(ret)
+	}
+	defer C.git_buf_free(&nameBuf)
+
+	return C.GoString(nameBuf.ptr), nil
+}
diff --git a/checkout.go b/checkout.go
index f4c1d4e..5b72b9a 100644
--- a/checkout.go
+++ b/checkout.go
@@ -2,10 +2,6 @@ package git
 
 /*
 #include <git2.h>
-git_checkout_opts git_checkout_opts_init() {
-	git_checkout_opts ret = GIT_CHECKOUT_OPTS_INIT;
-	return ret;
-}
 */
 import "C"
 import (
@@ -42,46 +38,59 @@ type CheckoutOpts struct {
 	FileOpenFlags  int				// Default is O_CREAT | O_TRUNC | O_WRONLY
 }
 
-// Convert the CheckoutOpts struct to the corresponding C-struct
-func populateCheckoutOpts(ptr *C.git_checkout_opts, opts *CheckoutOpts) {
-	*ptr = C.git_checkout_opts_init()
+// Convert the CheckoutOpts struct to the corresponding
+// C-struct. Returns a pointer to ptr, or nil if opts is nil, in order
+// to help with what to pass.
+func populateCheckoutOpts(ptr *C.git_checkout_options, opts *CheckoutOpts) *C.git_checkout_options {
 	if opts == nil {
-		return
+		return nil
 	}
+
+	C.git_checkout_init_opts(ptr, 1)
 	ptr.checkout_strategy = C.uint(opts.Strategy)
 	ptr.disable_filters = cbool(opts.DisableFilters)
 	ptr.dir_mode = C.uint(opts.DirMode.Perm())
 	ptr.file_mode = C.uint(opts.FileMode.Perm())
+
+	return ptr
 }
 
 // Updates files in the index and the working tree to match the content of
-// the commit pointed at by HEAD.
-func (v *Repository) Checkout(opts *CheckoutOpts) error {
-	var copts C.git_checkout_opts
-	populateCheckoutOpts(&copts, opts)
+// the commit pointed at by HEAD. opts may be nil.
+func (v *Repository) CheckoutHead(opts *CheckoutOpts) error {
+	var copts C.git_checkout_options
+
+	ptr := populateCheckoutOpts(&copts, opts)
 
 	runtime.LockOSThread()
 	defer runtime.UnlockOSThread()
 
-	ret := C.git_checkout_head(v.ptr, &copts)
+	ret := C.git_checkout_head(v.ptr, ptr)
 	if ret < 0 {
-		return LastError()
+		return MakeGitError(ret)
 	}
 
 	return nil
 }
 
-// Updates files in the working tree to match the content of the index.
+// Updates files in the working tree to match the content of the given
+// index. If index is nil, the repository's index will be used. opts
+// may be nil.
 func (v *Repository) CheckoutIndex(index *Index, opts *CheckoutOpts) error {
-	var copts C.git_checkout_opts
-	populateCheckoutOpts(&copts, opts)
+	var copts C.git_checkout_options
+	ptr := populateCheckoutOpts(&copts, opts)
+
+	var iptr *C.git_index = nil
+	if index != nil {
+		iptr = index.ptr
+	}
 
 	runtime.LockOSThread()
 	defer runtime.UnlockOSThread()
 
-	ret := C.git_checkout_index(v.ptr, index.ptr, &copts)
+	ret := C.git_checkout_index(v.ptr, iptr, ptr)
 	if ret < 0 {
-		return LastError()
+		return MakeGitError(ret)
 	}
 
 	return nil
diff --git a/clone.go b/clone.go
new file mode 100644
index 0000000..1bc3261
--- /dev/null
+++ b/clone.go
@@ -0,0 +1,75 @@
+package git
+
+/*
+#include <git2.h>
+#include <git2/errors.h>
+
+*/
+import "C"
+import (
+	"runtime"
+	"unsafe"
+)
+
+type CloneOptions struct {
+	*CheckoutOpts
+	*RemoteCallbacks
+	Bare             bool
+	IgnoreCertErrors bool
+	RemoteName       string
+	CheckoutBranch   string
+}
+
+func Clone(url string, path string, options *CloneOptions) (*Repository, error) {
+	repo := new(Repository)
+
+	curl := C.CString(url)
+	defer C.free(unsafe.Pointer(curl))
+
+	cpath := C.CString(path)
+	defer C.free(unsafe.Pointer(cpath))
+
+	var copts C.git_clone_options
+	populateCloneOptions(&copts, options)
+
+	// finish populating clone options here so we can defer CString free
+	if len(options.RemoteName) != 0 {
+		copts.remote_name = C.CString(options.RemoteName)
+		defer C.free(unsafe.Pointer(copts.remote_name))
+	}
+
+	if len(options.CheckoutBranch) != 0 {
+		copts.checkout_branch = C.CString(options.CheckoutBranch)
+		defer C.free(unsafe.Pointer(copts.checkout_branch))
+	}
+
+	runtime.LockOSThread()
+	defer runtime.UnlockOSThread()
+	ret := C.git_clone(&repo.ptr, curl, cpath, &copts)
+	if ret < 0 {
+		return nil, MakeGitError(ret)
+	}
+
+	runtime.SetFinalizer(repo, (*Repository).Free)
+	return repo, nil
+}
+
+func populateCloneOptions(ptr *C.git_clone_options, opts *CloneOptions) {
+	C.git_clone_init_options(ptr, C.GIT_CLONE_OPTIONS_VERSION)
+
+	if opts == nil {
+		return
+	}
+	populateCheckoutOpts(&ptr.checkout_opts, opts.CheckoutOpts)
+	populateRemoteCallbacks(&ptr.remote_callbacks, opts.RemoteCallbacks)
+	if opts.Bare {
+		ptr.bare = 1
+	} else {
+		ptr.bare = 0
+	}
+	if opts.IgnoreCertErrors {
+		ptr.ignore_cert_errors = 1
+	} else {
+		ptr.ignore_cert_errors = 0
+	}
+}
diff --git a/clone_test.go b/clone_test.go
new file mode 100644
index 0000000..97366bf
--- /dev/null
+++ b/clone_test.go
@@ -0,0 +1,23 @@
+package git
+
+import (
+	"io/ioutil"
+	"os"
+	"testing"
+)
+
+func TestClone(t *testing.T) {
+
+	repo := createTestRepo(t)
+	defer os.RemoveAll(repo.Workdir())
+
+	seedTestRepo(t, repo)
+
+	path, err := ioutil.TempDir("", "git2go")
+	checkFatal(t, err)
+
+	_, err = Clone(repo.Path(), path, &CloneOptions{Bare: true})
+	defer os.RemoveAll(path)
+
+	checkFatal(t, err)
+}
diff --git a/commit.go b/commit.go
index 0c64c76..0a5cfce 100644
--- a/commit.go
+++ b/commit.go
@@ -17,56 +17,57 @@ import (
 // Commit
 type Commit struct {
 	gitObject
+	cast_ptr *C.git_commit
 }
 
 func (c Commit) Message() string {
-	return C.GoString(C.git_commit_message(c.ptr))
+	return C.GoString(C.git_commit_message(c.cast_ptr))
 }
 
 func (c Commit) Tree() (*Tree, error) {
-	var ptr *C.git_object
+	var ptr *C.git_tree
 
 	runtime.LockOSThread()
 	defer runtime.UnlockOSThread()
 
-	err := C.git_commit_tree(&ptr, c.ptr)
+	err := C.git_commit_tree(&ptr, c.cast_ptr)
 	if err < 0 {
-		return nil, LastError()
+		return nil, MakeGitError(err)
 	}
 
-	return allocObject(ptr).(*Tree), nil
+	return allocObject((*C.git_object)(ptr)).(*Tree), nil
 }
 
 func (c Commit) TreeId() *Oid {
-	return newOidFromC(C.git_commit_tree_id(c.ptr))
+	return newOidFromC(C.git_commit_tree_id(c.cast_ptr))
 }
 
 func (c Commit) Author() *Signature {
-	ptr := C.git_commit_author(c.ptr)
-	return newSignatureFromC(ptr)
+	cast_ptr := C.git_commit_author(c.cast_ptr)
+	return newSignatureFromC(cast_ptr)
 }
 
 func (c Commit) Committer() *Signature {
-	ptr := C.git_commit_committer(c.ptr)
-	return newSignatureFromC(ptr)
+	cast_ptr := C.git_commit_committer(c.cast_ptr)
+	return newSignatureFromC(cast_ptr)
 }
 
 func (c *Commit) Parent(n uint) *Commit {
-	var cobj *C.git_object
-	ret := C.git_commit_parent(&cobj, c.ptr, C.uint(n))
+	var cobj *C.git_commit
+	ret := C.git_commit_parent(&cobj, c.cast_ptr, C.uint(n))
 	if ret != 0 {
 		return nil
 	}
 
-	return allocObject(cobj).(*Commit)
+	return allocObject((*C.git_object)(cobj)).(*Commit)
 }
 
 func (c *Commit) ParentId(n uint) *Oid {
-	return newOidFromC(C.git_commit_parent_id(c.ptr, C.uint(n)))
+	return newOidFromC(C.git_commit_parent_id(c.cast_ptr, C.uint(n)))
 }
 
 func (c *Commit) ParentCount() uint {
-	return uint(C.git_commit_parentcount(c.ptr))
+	return uint(C.git_commit_parentcount(c.cast_ptr))
 }
 
 // Signature
diff --git a/config.go b/config.go
index 2aa073a..6b1f093 100644
--- a/config.go
+++ b/config.go
@@ -10,11 +10,81 @@ import (
 	"unsafe"
 )
 
+type ConfigLevel int
+
+const (
+	// System-wide configuration file; /etc/gitconfig on Linux systems
+	ConfigLevelSystem ConfigLevel = C.GIT_CONFIG_LEVEL_SYSTEM
+
+	// XDG compatible configuration file; typically ~/.config/git/config
+	ConfigLevelXDG ConfigLevel = C.GIT_CONFIG_LEVEL_XDG
+
+	// User-specific configuration file (also called Global configuration
+	// file); typically ~/.gitconfig
+	ConfigLevelGlobal ConfigLevel = C.GIT_CONFIG_LEVEL_GLOBAL
+
+	// Repository specific configuration file; $WORK_DIR/.git/config on
+	// non-bare repos
+	ConfigLevelLocal ConfigLevel = C.GIT_CONFIG_LEVEL_LOCAL
+
+	// Application specific configuration file; freely defined by applications
+	ConfigLevelApp ConfigLevel = C.GIT_CONFIG_LEVEL_APP
+
+	// Represents the highest level available config file (i.e. the most
+	// specific config file available that actually is loaded)
+	ConfigLevelHighest ConfigLevel = C.GIT_CONFIG_HIGHEST_LEVEL
+)
+
+type ConfigEntry struct {
+	Name string
+	Value string
+	Level ConfigLevel
+}
+
+func newConfigEntryFromC(centry *C.git_config_entry) *ConfigEntry {
+	return &ConfigEntry{
+		Name: C.GoString(centry.name),
+		Value: C.GoString(centry.value),
+		Level: ConfigLevel(centry.level),
+	}
+}
+
 type Config struct {
 	ptr *C.git_config
 }
 
-func (c *Config) LookupInt32(name string) (v int32, err error) {
+// NewConfig creates a new empty configuration object
+func NewConfig() (*Config, error) {
+	config := new(Config)
+
+	runtime.LockOSThread()
+	defer runtime.UnlockOSThread()
+
+	if ret := C.git_config_new(&config.ptr); ret < 0 {
+		return nil, MakeGitError(ret)
+	}
+
+	return config, nil
+}
+
+// AddFile adds a file-backed backend to the config object at the specified level.
+func (c *Config) AddFile(path string, level ConfigLevel, force bool) error {
+	cpath := C.CString(path)
+	defer C.free(unsafe.Pointer(cpath))
+
+	runtime.LockOSThread()
+	defer runtime.UnlockOSThread()
+
+
+	ret := C.git_config_add_file_ondisk(c.ptr, cpath, C.git_config_level_t(level), cbool(force))
+	if ret < 0 {
+		return MakeGitError(ret)
+	}
+
+	return nil
+}
+
+func (c *Config) LookupInt32(name string) (int32, error) {
 	var out C.int32_t
 	cname := C.CString(name)
 	defer C.free(unsafe.Pointer(cname))
@@ -24,13 +94,13 @@ func (c *Config) LookupInt32(name string) (v int32, err error) {
 
 	ret := C.git_config_get_int32(&out, c.ptr, cname)
 	if ret < 0 {
-		return 0, LastError()
+		return 0, MakeGitError(ret)
 	}
 
 	return int32(out), nil
 }
 
-func (c *Config) LookupInt64(name string) (v int64, err error) {
+func (c *Config) LookupInt64(name string) (int64, error) {
 	var out C.int64_t
 	cname := C.CString(name)
 	defer C.free(unsafe.Pointer(cname))
@@ -40,13 +110,13 @@ func (c *Config) LookupInt64(name string) (v int64, err error) {
 
 	ret := C.git_config_get_int64(&out, c.ptr, cname)
 	if ret < 0 {
-		return 0, LastError()
+		return 0, MakeGitError(ret)
 	}
 
 	return int64(out), nil
 }
 
-func (c *Config) LookupString(name string) (v string, err error) {
+func (c *Config) LookupString(name string) (string, error) {
 	var ptr *C.char
 	cname := C.CString(name)
 	defer C.free(unsafe.Pointer(cname))
@@ -54,15 +124,91 @@ func (c *Config) LookupString(name string) (v string, err error) {
 	runtime.LockOSThread()
 	defer runtime.UnlockOSThread()
 
-	ret := C.git_config_get_string(&ptr, c.ptr, cname)
-	if ret < 0 {
-		return "", LastError()
+	if ret := C.git_config_get_string(&ptr, c.ptr, cname); ret < 0 {
+		return "", MakeGitError(ret)
 	}
 
 	return C.GoString(ptr), nil
 }
 
-func (c *Config) Set(name, value string) (err error) {
+
+func (c *Config) LookupBool(name string) (bool, error) {
+	var out C.int
+	cname := C.CString(name)
+	defer C.free(unsafe.Pointer(cname))
+
+	runtime.LockOSThread()
+	defer runtime.UnlockOSThread()
+
+	ret := C.git_config_get_bool(&out, c.ptr, cname)
+	if ret < 0 {
+		return false, MakeGitError(ret)
+	}
+
+	return out != 0, nil
+}
+
+func (c *Config) NewMultivarIterator(name, regexp string) (*ConfigIterator, error) {
+	cname := C.CString(name)
+	defer C.free(unsafe.Pointer(cname))
+
+	var cregexp *C.char
+	if regexp == "" {
+		cregexp = nil
+	} else {
+		cregexp = C.CString(regexp)
+		defer C.free(unsafe.Pointer(cregexp))
+	}
+
+	iter := new(ConfigIterator)
+
+	runtime.LockOSThread()
+	defer runtime.UnlockOSThread()
+
+	ret := C.git_config_multivar_iterator_new(&iter.ptr, c.ptr, cname, cregexp)
+	if ret < 0 {
+		return nil, MakeGitError(ret)
+	}
+
+	runtime.SetFinalizer(iter, (*ConfigIterator).Free)
+	return iter, nil
+}
+
+// NewIterator creates an iterator over each entry in the
+// configuration
+func (c *Config) NewIterator() (*ConfigIterator, error) {
+	iter := new(ConfigIterator)
+
+	runtime.LockOSThread()
+	defer runtime.UnlockOSThread()
+
+	ret := C.git_config_iterator_new(&iter.ptr, c.ptr)
+	if ret < 0 {
+		return nil, MakeGitError(ret)
+	}
+
+	return iter, nil
+}
+
+// NewIteratorGlob creates an iterator over each entry in the
+// configuration whose name matches the given regular expression
+func (c *Config) NewIteratorGlob(regexp string) (*ConfigIterator, error) {
+	iter := new(ConfigIterator)
+	cregexp := C.CString(regexp)
+	defer C.free(unsafe.Pointer(cregexp))
+
+	runtime.LockOSThread()
+	defer runtime.UnlockOSThread()
+
+	ret := C.git_config_iterator_glob_new(&iter.ptr, c.ptr, cregexp)
+	if ret < 0 {
+		return nil, MakeGitError(ret)
+	}
+
+	return iter, nil
+}
+
+func (c *Config) SetString(name, value string) (err error) {
 	cname := C.CString(name)
 	defer C.free(unsafe.Pointer(cname))
 
@@ -74,7 +220,7 @@ func (c *Config) Set(name, value string) (err error) {
 
 	ret := C.git_config_set_string(c.ptr, cname, cvalue)
 	if ret < 0 {
-		return LastError()
+		return MakeGitError(ret)
 	}
 
 	return nil
@@ -84,3 +230,148 @@ func (c *Config) Free() {
 	runtime.SetFinalizer(c, nil)
 	C.git_config_free(c.ptr)
 }
+
+func (c *Config) SetInt32(name string, value int32) (err error) {
+	cname := C.CString(name)
+	defer C.free(unsafe.Pointer(cname))
+
+	ret := C.git_config_set_int32(c.ptr, cname, C.int32_t(value))
+	if ret < 0 {
+		return MakeGitError(ret)
+	}
+
+	return nil
+}
+
+func (c *Config) SetInt64(name string, value int64) (err error) {
+	cname := C.CString(name)
+	defer C.free(unsafe.Pointer(cname))
+
+	runtime.LockOSThread()
+	defer runtime.UnlockOSThread()
+
+	ret := C.git_config_set_int64(c.ptr, cname, C.int64_t(value))
+	if ret < 0 {
+		return MakeGitError(ret)
+	}
+
+	return nil
+}
+
+func (c *Config) SetBool(name string, value bool) (err error) {
+	cname := C.CString(name)
+	defer C.free(unsafe.Pointer(cname))
+
+	runtime.LockOSThread()
+	defer runtime.UnlockOSThread()
+
+	ret := C.git_config_set_bool(c.ptr, cname, cbool(value))
+	if ret < 0 {
+		return MakeGitError(ret)
+	}
+
+	return nil
+}
+
+func (c *Config) SetMultivar(name, regexp, value string) (err error) {
+	cname := C.CString(name)
+	defer C.free(unsafe.Pointer(cname))
+
+	cregexp := C.CString(regexp)
+	defer C.free(unsafe.Pointer(cregexp))
+
+	cvalue := C.CString(value)
+	defer C.free(unsafe.Pointer(cvalue))
+
+	runtime.LockOSThread()
+	defer runtime.UnlockOSThread()
+
+	ret := C.git_config_set_multivar(c.ptr, cname, cregexp, cvalue)
+	if ret < 0 {
+		return MakeGitError(ret)
+	}
+
+	return nil
+}
+
+func (c *Config) Delete(name string) error {
+	cname := C.CString(name)
+	defer C.free(unsafe.Pointer(cname))
+
+	runtime.LockOSThread()
+	defer runtime.UnlockOSThread()
+
+	ret := C.git_config_delete_entry(c.ptr, cname)
+
+	if ret < 0 {
+		return MakeGitError(ret)
+	}
+
+	return nil
+}
+
+// OpenLevel creates a single-level focused config object from a multi-level one
+func (c *Config) OpenLevel(parent *Config, level ConfigLevel) (*Config, error) {
+	config := new(Config)
+
+	runtime.LockOSThread()
+	defer runtime.UnlockOSThread()
+
+	ret := C.git_config_open_level(&config.ptr, parent.ptr, C.git_config_level_t(level))
+	if ret < 0 {
+		return nil, MakeGitError(ret)
+	}
+
+	return config, nil
+}
+
+// OpenOndisk creates a new config instance containing a single on-disk file
+func OpenOndisk(parent *Config, path string) (*Config, error) {
+	cpath := C.CString(path)
+	defer C.free(unsafe.Pointer(cpath))
+
+	config := new(Config)
+
+	runtime.LockOSThread()
+	defer runtime.UnlockOSThread()
+
+	if ret := C.git_config_open_ondisk(&config.ptr, cpath); ret < 0 {
+		return nil, MakeGitError(ret)
+	}
+
+	return config, nil
+}
+
+// Refresh refreshes the configuration to reflect any changes made externally e.g. on disk
+func (c *Config) Refresh() error {
+	runtime.LockOSThread()
+	defer runtime.UnlockOSThread()
+
+	if ret := C.git_config_refresh(c.ptr); ret < 0 {
+		return MakeGitError(ret)
+	}
+
+	return nil
+}
+
+type ConfigIterator struct {
+	ptr *C.git_config_iterator
+}
+
+// Next returns the next entry for this iterator
+func (iter *ConfigIterator) Next() (*ConfigEntry, error) {
+	var centry *C.git_config_entry
+
+	ret := C.git_config_next(&centry, iter.ptr)
+	if ret < 0 {
+		return nil, MakeGitError(ret)
+	}
+
+	return newConfigEntryFromC(centry), nil
+}
+
+func (iter *ConfigIterator) Free() {
+	runtime.SetFinalizer(iter, nil)
+	C.free(unsafe.Pointer(iter.ptr))
+}
+
diff --git a/credentials.go b/credentials.go
new file mode 100644
index 0000000..c5ed055
--- /dev/null
+++ b/credentials.go
@@ -0,0 +1,74 @@
+package git
+
+/*
+#include <git2.h>
+#include <git2/errors.h>
+*/
+import "C"
+import "unsafe"
+
+type CredType uint
+
+const (
+	CredTypeUserpassPlaintext CredType = C.GIT_CREDTYPE_USERPASS_PLAINTEXT
+	CredTypeSshKey                     = C.GIT_CREDTYPE_SSH_KEY
+	CredTypeSshCustom                  = C.GIT_CREDTYPE_SSH_CUSTOM
+	CredTypeDefault                    = C.GIT_CREDTYPE_DEFAULT
+)
+
+type Cred struct {
+	ptr *C.git_cred
+}
+
+func (o *Cred) HasUsername() bool {
+	if C.git_cred_has_username(o.ptr) == 1 {
+		return true
+	}
+	return false
+}
+
+func (o *Cred) Type() CredType {
+	return (CredType)(o.ptr.credtype)
+}
+
+func credFromC(ptr *C.git_cred) *Cred {
+	return &Cred{ptr}
+}
+
+func NewCredUserpassPlaintext(username string, password string) (int, Cred) {
+	cred := Cred{}
+	cusername := C.CString(username)
+	defer C.free(unsafe.Pointer(cusername))
+	cpassword := C.CString(password)
+	defer C.free(unsafe.Pointer(cpassword))
+	ret := C.git_cred_userpass_plaintext_new(&cred.ptr, cusername, cpassword)
+	return int(ret), cred
+}
+
+func NewCredSshKey(username string, publickey string, privatekey string, passphrase string) (int, Cred) {
+	cred := Cred{}
+	cusername := C.CString(username)
+	defer C.free(unsafe.Pointer(cusername))
+	cpublickey := C.CString(publickey)
+	defer C.free(unsafe.Pointer(cpublickey))
+	cprivatekey := C.CString(privatekey)
+	defer C.free(unsafe.Pointer(cprivatekey))
+	cpassphrase := C.CString(passphrase)
+	defer C.free(unsafe.Pointer(cpassphrase))
+	ret := C.git_cred_ssh_key_new(&cred.ptr, cusername, cpublickey, cprivatekey, cpassphrase)
+	return int(ret), cred
+}
+
+func NewCredSshKeyFromAgent(username string) (int, Cred) {
+	cred := Cred{}
+	cusername := C.CString(username)
+	defer C.free(unsafe.Pointer(cusername))
+	ret := C.git_cred_ssh_key_from_agent(&cred.ptr, cusername)
+	return int(ret), cred
+}
+
+func NewCredDefault() (int, Cred) {
+	cred := Cred{}
+	ret := C.git_cred_default_new(&cred.ptr)
+	return int(ret), cred
+}
diff --git a/git.go b/git.go
index 72ea33e..8159244 100644
--- a/git.go
+++ b/git.go
@@ -8,10 +8,11 @@ package git
 import "C"
 import (
 	"bytes"
+	"encoding/hex"
 	"errors"
 	"runtime"
-	"unsafe"
 	"strings"
+	"unsafe"
 )
 
 const (
@@ -28,10 +29,8 @@ func init() {
 	C.git_threads_init()
 }
 
-// Oid
-type Oid struct {
-	bytes [20]byte
-}
+// Oid represents the id for a Git object.
+type Oid [20]byte
 
 func newOidFromC(coid *C.git_oid) *Oid {
 	if coid == nil {
@@ -39,62 +38,57 @@ func newOidFromC(coid *C.git_oid) *Oid {
 	}
 
 	oid := new(Oid)
-	copy(oid.bytes[0:20], C.GoBytes(unsafe.Pointer(coid), 20))
+	copy(oid[0:20], C.GoBytes(unsafe.Pointer(coid), 20))
 	return oid
 }
 
-func NewOid(b []byte) *Oid {
+func NewOidFromBytes(b []byte) *Oid {
 	oid := new(Oid)
-	copy(oid.bytes[0:20], b[0:20])
+	copy(oid[0:20], b[0:20])
 	return oid
 }
 
 func (oid *Oid) toC() *C.git_oid {
-	return (*C.git_oid)(unsafe.Pointer(&oid.bytes))
+	return (*C.git_oid)(unsafe.Pointer(oid))
 }
 
-func NewOidFromString(s string) (*Oid, error) {
-	o := new(Oid)
-	cs := C.CString(s)
-	defer C.free(unsafe.Pointer(cs))
+func NewOid(s string) (*Oid, error) {
+	if len(s) > C.GIT_OID_HEXSZ {
+		return nil, errors.New("string is too long for oid")
+	}
 
-	runtime.LockOSThread()
-	defer runtime.UnlockOSThread()
+	o := new(Oid)
 
-	if C.git_oid_fromstr(o.toC(), cs) < 0 {
-		return nil, LastError()
+	slice, error := hex.DecodeString(s)
+	if error != nil {
+		return nil, error
 	}
 
+	copy(o[:], slice[:20])
 	return o, nil
 }
 
 func (oid *Oid) String() string {
-	buf := make([]byte, 40)
-	C.git_oid_fmt((*C.char)(unsafe.Pointer(&buf[0])), oid.toC())
-	return string(buf)
-}
-
-func (oid *Oid) Bytes() []byte {
-	return oid.bytes[0:]
+	return hex.EncodeToString(oid[:])
 }
 
 func (oid *Oid) Cmp(oid2 *Oid) int {
-	return bytes.Compare(oid.bytes[:], oid2.bytes[:])
+	return bytes.Compare(oid[:], oid2[:])
 }
 
 func (oid *Oid) Copy() *Oid {
 	ret := new(Oid)
-	copy(ret.bytes[:], oid.bytes[:])
+	copy(ret[:], oid[:])
 	return ret
 }
 
 func (oid *Oid) Equal(oid2 *Oid) bool {
-	return bytes.Equal(oid.bytes[:], oid2.bytes[:])
+	return bytes.Equal(oid[:], oid2[:])
 }
 
 func (oid *Oid) IsZero() bool {
-	for _, a := range oid.bytes {
-		if a != '0' {
+	for _, a := range oid {
+		if a != 0 {
 			return false
 		}
 	}
@@ -102,7 +96,7 @@ func (oid *Oid) IsZero() bool {
 }
 
 func (oid *Oid) NCmp(oid2 *Oid, n uint) int {
-	return bytes.Compare(oid.bytes[:n], oid2.bytes[:n])
+	return bytes.Compare(oid[:n], oid2[:n])
 }
 
 func ShortenOids(ids []*Oid, minlen int) (int, error) {
@@ -123,27 +117,40 @@ func ShortenOids(ids []*Oid, minlen int) (int, error) {
 		buf[40] = 0
 		ret = C.git_oid_shorten_add(shorten, (*C.char)(unsafe.Pointer(&buf[0])))
 		if ret < 0 {
-			return int(ret), LastError()
+			return int(ret), MakeGitError(ret)
 		}
 	}
 	return int(ret), nil
 }
 
 type GitError struct {
-	Message string
-	Code    int
+	Message   string
+	Class     int
+	ErrorCode int
 }
 
 func (e GitError) Error() string {
 	return e.Message
 }
 
-func LastError() error {
+func IsNotExist(err error) bool {
+	return err.(*GitError).ErrorCode == C.GIT_ENOTFOUND
+}
+
+func IsExist(err error) bool {
+	return err.(*GitError).ErrorCode == C.GIT_EEXISTS
+}
+
+func MakeGitError(errorCode C.int) error {
 	err := C.giterr_last()
 	if err == nil {
-		return &GitError{"No message", 0}
+		return &GitError{"No message", C.GITERR_INVALID, C.GIT_ERROR}
 	}
-	return &GitError{C.GoString(err.message), int(err.klass)}
+	return &GitError{C.GoString(err.message), int(err.klass), int(errorCode)}
+}
+
+func MakeGitError2(err int) error {
+	return MakeGitError(C.int(err))
 }
 
 func cbool(b bool) C.int {
@@ -175,7 +182,7 @@ func Discover(start string, across_fs bool, ceiling_dirs []string) (string, erro
 
 	ret := C.git_repository_discover(&buf, cstart, cbool(across_fs), ceildirs)
 	if ret < 0 {
-		return "", LastError()
+		return "", MakeGitError(ret)
 	}
 
 	return C.GoString(buf.ptr), nil
diff --git a/git_test.go b/git_test.go
index 52aea1d..6542ca0 100644
--- a/git_test.go
+++ b/git_test.go
@@ -1,8 +1,8 @@
 package git
 
 import (
-	"testing"
 	"io/ioutil"
+	"testing"
 	"time"
 )
 
@@ -14,7 +14,17 @@ func createTestRepo(t *testing.T) *Repository {
 	checkFatal(t, err)
 
 	tmpfile := "README"
-	err = ioutil.WriteFile(path + "/" + tmpfile, []byte("foo\n"), 0644)
+	err = ioutil.WriteFile(path+"/"+tmpfile, []byte("foo\n"), 0644)
+	checkFatal(t, err)
+
+	return repo
+}
+
+func createBareTestRepo(t *testing.T) *Repository {
+	// figure out where we can create the test repo
+	path, err := ioutil.TempDir("", "git2go")
+	checkFatal(t, err)
+	repo, err := InitRepository(path, true)
 	checkFatal(t, err)
 
 	return repo
@@ -45,3 +55,10 @@ func seedTestRepo(t *testing.T, repo *Repository) (*Oid, *Oid) {
 	return commitId, treeId
 }
 
+func TestOidZero(t *testing.T) {
+	var zeroId Oid
+
+	if !zeroId.IsZero() {
+		t.Error("Zero Oid is not zero")
+	}
+}
diff --git a/index.go b/index.go
index fb32010..d3178a2 100644
--- a/index.go
+++ b/index.go
@@ -6,7 +6,9 @@ package git
 */
 import "C"
 import (
+	"fmt"
 	"runtime"
+	"time"
 	"unsafe"
 )
 
@@ -14,6 +16,50 @@ type Index struct {
 	ptr *C.git_index
 }
 
+type IndexEntry struct {
+	Ctime time.Time
+	Mtime time.Time
+	Mode  uint
+	Uid   uint
+	Gid   uint
+	Size  uint
+	Id    *Oid
+	Path  string
+}
+
+func newIndexEntryFromC(entry *C.git_index_entry) *IndexEntry {
+	if entry == nil {
+		return nil
+	}
+	return &IndexEntry{
+		time.Unix(int64(entry.ctime.seconds), int64(entry.ctime.nanoseconds)),
+		time.Unix(int64(entry.mtime.seconds), int64(entry.mtime.nanoseconds)),
+		uint(entry.mode),
+		uint(entry.uid),
+		uint(entry.gid),
+		uint(entry.file_size),
+		newOidFromC(&entry.id),
+		C.GoString(entry.path),
+	}
+}
+
+func populateCIndexEntry(source *IndexEntry, dest *C.git_index_entry) {
+	dest.ctime.seconds = C.git_time_t(source.Ctime.Unix())
+	dest.ctime.nanoseconds = C.uint(source.Ctime.UnixNano())
+	dest.mtime.seconds = C.git_time_t(source.Mtime.Unix())
+	dest.mtime.nanoseconds = C.uint(source.Mtime.UnixNano())
+	dest.mode = C.uint(source.Mode)
+	dest.uid = C.uint(source.Uid)
+	dest.gid = C.uint(source.Gid)
+	dest.file_size = C.git_off_t(source.Size)
+	dest.id = *source.Id.toC()
+	dest.path = C.CString(source.Path)
+}
+
+func freeCIndexEntry(entry *C.git_index_entry) {
+	C.free(unsafe.Pointer(entry.path))
+}
+
 func newIndexFromC(ptr *C.git_index) *Index {
 	idx := &Index{ptr}
 	runtime.SetFinalizer(idx, (*Index).Free)
@@ -29,12 +75,26 @@ func (v *Index) AddByPath(path string) error {
 
 	ret := C.git_index_add_bypath(v.ptr, cstr)
 	if ret < 0 {
-		return LastError()
+		return MakeGitError(ret)
 	}
 
 	return nil
 }
 
+func (v *Index) WriteTreeTo(repo *Repository) (*Oid, error) {
+	oid := new(Oid)
+
+	runtime.LockOSThread()
+	defer runtime.UnlockOSThread()
+
+	ret := C.git_index_write_tree_to(oid.toC(), v.ptr, repo.ptr)
+	if ret < 0 {
+		return nil, MakeGitError(ret)
+	}
+
+	return oid, nil
+}
+
 func (v *Index) WriteTree() (*Oid, error) {
 	oid := new(Oid)
 
@@ -43,19 +103,19 @@ func (v *Index) WriteTree() (*Oid, error) {
 
 	ret := C.git_index_write_tree(oid.toC(), v.ptr)
 	if ret < 0 {
-		return nil, LastError()
+		return nil, MakeGitError(ret)
 	}
 
 	return oid, nil
 }
 
-func (v *Index) Write() (error) {
+func (v *Index) Write() error {
 	runtime.LockOSThread()
 	defer runtime.UnlockOSThread()
 
 	ret := C.git_index_write(v.ptr)
 	if ret < 0 {
-		return LastError()
+		return MakeGitError(ret)
 	}
 
 	return nil
@@ -65,3 +125,157 @@ func (v *Index) Free() {
 	runtime.SetFinalizer(v, nil)
 	C.git_index_free(v.ptr)
 }
+
+func (v *Index) EntryCount() uint {
+	return uint(C.git_index_entrycount(v.ptr))
+}
+
+func (v *Index) EntryByIndex(index uint) (*IndexEntry, error) {
+	centry := C.git_index_get_byindex(v.ptr, C.size_t(index))
+	if centry == nil {
+		return nil, fmt.Errorf("Index out of Bounds")
+	}
+	return newIndexEntryFromC(centry), nil
+}
+
+func (v *Index) HasConflicts() bool {
+	return C.git_index_has_conflicts(v.ptr) != 0
+}
+
+func (v *Index) CleanupConflicts() {
+	C.git_index_conflict_cleanup(v.ptr)
+}
+
+func (v *Index) AddConflict(ancestor *IndexEntry, our *IndexEntry, their *IndexEntry) error {
+
+	var cancestor *C.git_index_entry
+	var cour *C.git_index_entry
+	var ctheir *C.git_index_entry
+
+	if ancestor != nil {
+		cancestor = &C.git_index_entry{}
+		populateCIndexEntry(ancestor, cancestor)
+		defer freeCIndexEntry(cancestor)
+	}
+
+	if our != nil {
+		cour = &C.git_index_entry{}
+		populateCIndexEntry(our, cour)
+		defer freeCIndexEntry(cour)
+	}
+
+	if their != nil {
+		ctheir = &C.git_index_entry{}
+		populateCIndexEntry(their, ctheir)
+		defer freeCIndexEntry(ctheir)
+	}
+
+	runtime.LockOSThread()
+	defer runtime.UnlockOSThread()
+
+	ecode := C.git_index_conflict_add(v.ptr, cancestor, cour, ctheir)
+	if ecode < 0 {
+		return MakeGitError(ecode)
+	}
+	return nil
+}
+
+type IndexConflict struct {
+	Ancestor *IndexEntry
+	Our      *IndexEntry
+	Their    *IndexEntry
+}
+
+func (v *Index) GetConflict(path string) (IndexConflict, error) {
+
+	var cancestor *C.git_index_entry
+	var cour *C.git_index_entry
+	var ctheir *C.git_index_entry
+
+	cpath := C.CString(path)
+	defer C.free(unsafe.Pointer(cpath))
+
+	runtime.LockOSThread()
+	defer runtime.UnlockOSThread()
+
+	ecode := C.git_index_conflict_get(&cancestor, &cour, &ctheir, v.ptr, cpath)
+	if ecode < 0 {
+		return IndexConflict{}, MakeGitError(ecode)
+	}
+	return IndexConflict{
+		Ancestor: newIndexEntryFromC(cancestor),
+		Our:      newIndexEntryFromC(cour),
+		Their:    newIndexEntryFromC(ctheir),
+	}, nil
+}
+
+func (v *Index) RemoveConflict(path string) error {
+
+	cpath := C.CString(path)
+	defer C.free(unsafe.Pointer(cpath))
+
+	runtime.LockOSThread()
+	defer runtime.UnlockOSThread()
+
+	ecode := C.git_index_conflict_remove(v.ptr, cpath)
+	if ecode < 0 {
+		return MakeGitError(ecode)
+	}
+	return nil
+}
+
+type IndexConflictIterator struct {
+	ptr   *C.git_index_conflict_iterator
+	index *Index
+}
+
+func newIndexConflictIteratorFromC(index *Index, ptr *C.git_index_conflict_iterator) *IndexConflictIterator {
+	i := &IndexConflictIterator{ptr: ptr, index: index}
+	runtime.SetFinalizer(i, (*IndexConflictIterator).Free)
+	return i
+}
+
+func (v *IndexConflictIterator) Index() *Index {
+	return v.index
+}
+
+func (v *IndexConflictIterator) Free() {
+	runtime.SetFinalizer(v, nil)
+	C.git_index_conflict_iterator_free(v.ptr)
+}
+
+func (v *Index) ConflictIterator() (*IndexConflictIterator, error) {
+	var i *C.git_index_conflict_iterator
+
+	runtime.LockOSThread()
+	defer runtime.UnlockOSThread()
+
+	ecode := C.git_index_conflict_iterator_new(&i, v.ptr)
+	if ecode < 0 {
+		return nil, MakeGitError(ecode)
+	}
+	return newIndexConflictIteratorFromC(v, i), nil
+}
+
+func (v *IndexConflictIterator) Next() (IndexConflict, error) {
+	var cancestor *C.git_index_entry
+	var cour *C.git_index_entry
+	var ctheir *C.git_index_entry
+
+	runtime.LockOSThread()
+	defer runtime.UnlockOSThread()
+
+	ecode := C.git_index_conflict_next(&cancestor, &cour, &ctheir, v.ptr)
+	if ecode == C.GIT_ITEROVER {
+		return IndexConflict{}, ErrIterOver
+	}
+
+	if ecode < 0 {
+		return IndexConflict{}, MakeGitError(ecode)
+	}
+	return IndexConflict{
+		Ancestor: newIndexEntryFromC(cancestor),
+		Our:      newIndexEntryFromC(cour),
+		Their:    newIndexEntryFromC(ctheir),
+	}, nil
+}
diff --git a/index_test.go b/index_test.go
index 9828d0f..5920b93 100644
--- a/index_test.go
+++ b/index_test.go
@@ -22,6 +22,25 @@ func TestCreateRepoAndStage(t *testing.T) {
 	}
 }
 
+func TestIndexWriteTreeTo(t *testing.T) {
+	repo := createTestRepo(t)
+	defer os.RemoveAll(repo.Workdir())
+
+	repo2 := createTestRepo(t)
+	defer os.RemoveAll(repo.Workdir())
+
+	idx, err := repo.Index()
+	checkFatal(t, err)
+	err = idx.AddByPath("README")
+	checkFatal(t, err)
+	treeId, err := idx.WriteTreeTo(repo2)
+	checkFatal(t, err)
+
+	if treeId.String() != "b7119b11e8ef7a1a5a34d3ac87f5b075228ac81e" {
+		t.Fatalf("%v", treeId.String())
+	}
+}
+
 func checkFatal(t *testing.T, err error) {
 	if err == nil {
 		return
diff --git a/object.go b/object.go
index 090be1f..101d15e 100644
--- a/object.go
+++ b/object.go
@@ -48,7 +48,7 @@ func (t ObjectType) String() (string) {
 }
 
 func (o gitObject) Id() *Oid {
-	return newOidFromC(C.git_commit_id(o.ptr))
+	return newOidFromC(C.git_object_id(o.ptr))
 }
 
 func (o gitObject) Type() ObjectType {
@@ -57,24 +57,33 @@ func (o gitObject) Type() ObjectType {
 
 func (o *gitObject) Free() {
 	runtime.SetFinalizer(o, nil)
-	C.git_commit_free(o.ptr)
+	C.git_object_free(o.ptr)
 }
 
 func allocObject(cobj *C.git_object) Object {
 
 	switch ObjectType(C.git_object_type(cobj)) {
 	case ObjectCommit:
-		commit := &Commit{gitObject{cobj}}
+		commit := &Commit{
+			gitObject: gitObject{cobj},
+			cast_ptr:  (*C.git_commit)(cobj),
+		}
 		runtime.SetFinalizer(commit, (*Commit).Free)
 		return commit
 
 	case ObjectTree:
-		tree := &Tree{gitObject{cobj}}
+		tree := &Tree{
+			gitObject: gitObject{cobj},
+			cast_ptr:  (*C.git_tree)(cobj),
+		}
 		runtime.SetFinalizer(tree, (*Tree).Free)
 		return tree
 
 	case ObjectBlob:
-		blob := &Blob{gitObject{cobj}}
+		blob := &Blob{
+			gitObject: gitObject{cobj},
+			cast_ptr:  (*C.git_blob)(cobj),
+		}
 		runtime.SetFinalizer(blob, (*Blob).Free)
 		return blob
 	}
diff --git a/odb.go b/odb.go
index 80f8312..3b0c864 100644
--- a/odb.go
+++ b/odb.go
@@ -63,7 +63,7 @@ func (v *Odb) Write(data []byte, otype ObjectType) (oid *Oid, err error) {
 	ret := C.git_odb_write(oid.toC(), v.ptr, unsafe.Pointer(hdr.Data), C.size_t(hdr.Len), C.git_otype(otype))
 
 	if ret < 0 {
-		return nil, LastError()
+		return nil, MakeGitError(ret)
 	}
 
 	return oid, nil
@@ -77,7 +77,7 @@ func (v *Odb) Read(oid *Oid) (obj *OdbObject, err error) {
 
 	ret := C.git_odb_read(&obj.ptr, v.ptr, oid.toC())
 	if ret < 0 {
-		return nil, LastError()
+		return nil, MakeGitError(ret)
 	}
 
 	runtime.SetFinalizer(obj, (*OdbObject).Free)
@@ -121,7 +121,7 @@ func (v *Odb) Hash(data []byte, otype ObjectType) (oid *Oid, err error) {
 
 	ret := C.git_odb_hash(oid.toC(), ptr, C.size_t(header.Len), C.git_otype(otype));
 	if ret < 0 {
-		return nil, LastError()
+		return nil, MakeGitError(ret)
 	}
 	return oid, nil
 }
@@ -132,7 +132,7 @@ func (v *Odb) NewReadStream(id *Oid) (*OdbReadStream, error) {
 	stream := new(OdbReadStream)
 	ret := C.git_odb_open_rstream(&stream.ptr, v.ptr, id.toC())
 	if ret < 0 {
-		return nil, LastError()
+		return nil, MakeGitError(ret)
 	}
 
 	runtime.SetFinalizer(stream, (*OdbReadStream).Free)
@@ -146,7 +146,7 @@ func (v *Odb) NewWriteStream(size int, otype ObjectType) (*OdbWriteStream, error
 	stream := new(OdbWriteStream)
 	ret := C.git_odb_open_wstream(&stream.ptr, v.ptr, C.size_t(size), C.git_otype(otype))
 	if ret < 0 {
-		return nil, LastError()
+		return nil, MakeGitError(ret)
 	}
 
 	runtime.SetFinalizer(stream, (*OdbWriteStream).Free)
@@ -199,7 +199,7 @@ func (stream *OdbReadStream) Read(data []byte) (int, error) {
 	size := C.size_t(header.Cap)
 	ret := C.git_odb_stream_read(stream.ptr, ptr, size)
 	if ret < 0 {
-		return 0, LastError()
+		return 0, MakeGitError(ret)
 	}
 
 	header.Len = int(ret)
@@ -231,7 +231,7 @@ func (stream *OdbWriteStream) Write(data []byte) (int, error) {
 
 	ret := C.git_odb_stream_write(stream.ptr, ptr, size)
 	if ret < 0 {
-		return 0, LastError()
+		return 0, MakeGitError(ret)
 	}
 
 	return len(data), nil
@@ -242,7 +242,7 @@ func (stream *OdbWriteStream) Write(data []byte) (int, error) {
 func (stream *OdbWriteStream) Close() error {
 	ret := C.git_odb_stream_finalize_write(stream.Id.toC(), stream.ptr)
 	if ret < 0 {
-		return LastError()
+		return MakeGitError(ret)
 	}
 
 	return nil
diff --git a/odb_test.go b/odb_test.go
index a4f8943..17b3ad2 100644
--- a/odb_test.go
+++ b/odb_test.go
@@ -27,7 +27,7 @@ func TestOdbStream(t *testing.T) {
 	error = stream.Close()
 	checkFatal(t, error)
 
-	expectedId, error := NewOidFromString("30f51a3fba5274d53522d0f19748456974647b4f")
+	expectedId, error := NewOid("30f51a3fba5274d53522d0f19748456974647b4f")
 	checkFatal(t, error)
 	if stream.Id.Cmp(expectedId) != 0 {
 		t.Fatal("Wrong data written")
@@ -59,4 +59,4 @@ Initial commit.`;
 	if oid.Cmp(coid) != 0 {
 		t.Fatal("Hash and write Oids are different")
 	}
-}
\ No newline at end of file
+}
diff --git a/packbuilder.go b/packbuilder.go
index 333f183..70c4530 100644
--- a/packbuilder.go
+++ b/packbuilder.go
@@ -28,7 +28,7 @@ func (repo *Repository) NewPackbuilder() (*Packbuilder, error) {
 
 	ret := C.git_packbuilder_new(&builder.ptr, repo.ptr)
 	if ret != 0 {
-		return nil, LastError()
+		return nil, MakeGitError(ret)
 	}
 	runtime.SetFinalizer(builder, (*Packbuilder).Free)
 	return builder, nil
@@ -48,7 +48,7 @@ func (pb *Packbuilder) Insert(id *Oid, name string) error {
 
 	ret := C.git_packbuilder_insert(pb.ptr, id.toC(), cname)
 	if ret != 0 {
-		return LastError()
+		return MakeGitError(ret)
 	}
 	return nil
 }
@@ -59,7 +59,7 @@ func (pb *Packbuilder) InsertCommit(id *Oid) error {
 
 	ret := C.git_packbuilder_insert_commit(pb.ptr, id.toC())
 	if ret != 0 {
-		return LastError()
+		return MakeGitError(ret)
 	}
 	return nil
 }
@@ -70,7 +70,7 @@ func (pb *Packbuilder) InsertTree(id *Oid) error {
 
 	ret := C.git_packbuilder_insert_tree(pb.ptr, id.toC())
 	if ret != 0 {
-		return LastError()
+		return MakeGitError(ret)
 	}
 	return nil
 }
@@ -88,7 +88,7 @@ func (pb *Packbuilder) WriteToFile(name string, mode os.FileMode) error {
 
 	ret := C.git_packbuilder_write(pb.ptr, cname, C.uint(mode.Perm()), nil, nil)
 	if ret != 0 {
-		return LastError()
+		return MakeGitError(ret)
 	}
 	return nil
 }
diff --git a/push.go b/push.go
new file mode 100644
index 0000000..5fb7f07
--- /dev/null
+++ b/push.go
@@ -0,0 +1,182 @@
+package git
+
+/*
+#include <git2.h>
+#include <git2/errors.h>
+
+int _go_git_push_status_foreach(git_push *push, void *data);
+int _go_git_push_set_callbacks(git_push *push, void *packbuilder_progress_data, void *transfer_progress_data);
+
+*/
+import "C"
+import (
+	"runtime"
+	"unsafe"
+)
+
+type Push struct {
+	ptr *C.git_push
+
+	packbuilderProgress *PackbuilderProgressCallback
+	transferProgress    *PushTransferProgressCallback
+}
+
+func newPushFromC(cpush *C.git_push) *Push {
+	p := &Push{ptr: cpush}
+	runtime.SetFinalizer(p, (*Push).Free)
+	return p
+}
+
+func (p *Push) Free() {
+	runtime.SetFinalizer(p, nil)
+	C.git_push_free(p.ptr)
+}
+
+func (remote *Remote) NewPush() (*Push, error) {
+
+	runtime.LockOSThread()
+	defer runtime.UnlockOSThread()
+
+	var cpush *C.git_push
+	ret := C.git_push_new(&cpush, remote.ptr)
+	if ret < 0 {
+		return nil, MakeGitError(ret)
+	}
+	return newPushFromC(cpush), nil
+}
+
+func (p *Push) Finish() error {
+
+	runtime.LockOSThread()
+	defer runtime.UnlockOSThread()
+
+	ret := C.git_push_finish(p.ptr)
+	if ret < 0 {
+		return MakeGitError(ret)
+	}
+	return nil
+}
+
+func (p *Push) UnpackOk() bool {
+
+	ret := C.git_push_unpack_ok(p.ptr)
+	if ret == 0 {
+		return false
+	}
+	return true
+
+}
+
+func (p *Push) UpdateTips(sig *Signature, msg string) error {
+
+	var csig *C.git_signature = nil
+	if sig != nil {
+		csig = sig.toC()
+		defer C.free(unsafe.Pointer(csig))
+	}
+
+	var cmsg *C.char
+	if msg == "" {
+		cmsg = nil
+	} else {
+		cmsg = C.CString(msg)
+		defer C.free(unsafe.Pointer(cmsg))
+	}
+
+	runtime.LockOSThread()
+	defer runtime.UnlockOSThread()
+
+	ret := C.git_push_update_tips(p.ptr, csig, cmsg)
+	if ret < 0 {
+		return MakeGitError(ret)
+	}
+	return nil
+}
+
+func (p *Push) AddRefspec(refspec string) error {
+
+	crefspec := C.CString(refspec)
+	defer C.free(unsafe.Pointer(crefspec))
+
+	runtime.LockOSThread()
+	defer runtime.UnlockOSThread()
+
+	ret := C.git_push_add_refspec(p.ptr, crefspec)
+	if ret < 0 {
+		return MakeGitError(ret)
+	}
+	return nil
+}
+
+type PushOptions struct {
+	Version       uint
+	PbParallelism uint
+}
+
+func (p *Push) SetOptions(opts PushOptions) error {
+	copts := C.git_push_options{version: C.uint(opts.Version), pb_parallelism: C.uint(opts.PbParallelism)}
+
+	runtime.LockOSThread()
+	defer runtime.UnlockOSThread()
+
+	ret := C.git_push_set_options(p.ptr, &copts)
+	if ret < 0 {
+		return MakeGitError(ret)
+	}
+	return nil
+}
+
+type StatusForeachFunc func(ref string, msg string) int
+
+//export statusForeach
+func statusForeach(_ref *C.char, _msg *C.char, _data unsafe.Pointer) C.int {
+	ref := C.GoString(_ref)
+	msg := C.GoString(_msg)
+
+	cb := (*StatusForeachFunc)(_data)
+
+	return C.int((*cb)(ref, msg))
+}
+
+func (p *Push) StatusForeach(callback StatusForeachFunc) error {
+
+	runtime.LockOSThread()
+	defer runtime.UnlockOSThread()
+
+	ret := C._go_git_push_status_foreach(p.ptr, unsafe.Pointer(&callback))
+	if ret < 0 {
+		return MakeGitError(ret)
+	}
+	return nil
+
+}
+
+type PushCallbacks struct {
+	PackbuilderProgress *PackbuilderProgressCallback
+	TransferProgress    *PushTransferProgressCallback
+}
+
+type PackbuilderProgressCallback func(stage int, current uint, total uint) int
+type PushTransferProgressCallback func(current uint, total uint, bytes uint) int
+
+//export packbuilderProgress
+func packbuilderProgress(stage C.int, current C.uint, total C.uint, data unsafe.Pointer) C.int {
+	return C.int((*(*PackbuilderProgressCallback)(data))(int(stage), uint(current), uint(total)))
+}
+
+//export pushTransferProgress
+func pushTransferProgress(current C.uint, total C.uint, bytes C.size_t, data unsafe.Pointer) C.int {
+	return C.int((*(*PushTransferProgressCallback)(data))(uint(current), uint(total), uint(bytes)))
+}
+
+func (p *Push) SetCallbacks(callbacks PushCallbacks) {
+
+	runtime.LockOSThread()
+	defer runtime.UnlockOSThread()
+
+	// save callbacks so they don't get GC'd
+	p.packbuilderProgress = callbacks.PackbuilderProgress
+	p.transferProgress = callbacks.TransferProgress
+
+	C._go_git_push_set_callbacks(p.ptr, unsafe.Pointer(p.packbuilderProgress), unsafe.Pointer(p.transferProgress))
+}
diff --git a/push_test.go b/push_test.go
new file mode 100644
index 0000000..c1e6a22
--- /dev/null
+++ b/push_test.go
@@ -0,0 +1,59 @@
+package git
+
+import (
+	"log"
+	"os"
+	"testing"
+	"time"
+)
+
+func Test_Push_ToRemote(t *testing.T) {
+	repo := createBareTestRepo(t)
+	defer os.RemoveAll(repo.Path())
+	repo2 := createTestRepo(t)
+	defer os.RemoveAll(repo2.Workdir())
+
+	remote, err := repo2.CreateRemote("test_push", repo.Path())
+	checkFatal(t, err)
+
+	index, err := repo2.Index()
+	checkFatal(t, err)
+
+	index.AddByPath("README")
+
+	err = index.Write()
+	checkFatal(t, err)
+
+	newTreeId, err := index.WriteTree()
+	checkFatal(t, err)
+
+	tree, err := repo2.LookupTree(newTreeId)
+	checkFatal(t, err)
+
+	sig := &Signature{Name: "Rand Om Hacker", Email: "[email protected]", When: time.Now()}
+	// this should cause master branch to be created if it does not already exist
+	_, err = repo2.CreateCommit("HEAD", sig, sig, "message", tree)
+	checkFatal(t, err)
+
+	push, err := remote.NewPush()
+	checkFatal(t, err)
+
+	err = push.AddRefspec("refs/heads/master")
+	checkFatal(t, err)
+
+	err = push.Finish()
+	checkFatal(t, err)
+
+	err = push.StatusForeach(func(ref string, msg string) int {
+		log.Printf("%s -> %s", ref, msg)
+		return 0
+	})
+	checkFatal(t, err)
+
+	if !push.UnpackOk() {
+		t.Fatalf("unable to unpack")
+	}
+
+	defer remote.Free()
+	defer repo.Free()
+}
diff --git a/reference.go b/reference.go
index a2f1636..d246c55 100644
--- a/reference.go
+++ b/reference.go
@@ -40,12 +40,17 @@ func (v *Reference) SetSymbolicTarget(target string, sig *Signature, msg string)
 	csig := sig.toC()
 	defer C.free(unsafe.Pointer(csig))
 
-	cmsg := C.CString(msg)
-	defer C.free(unsafe.Pointer(cmsg))
+	var cmsg *C.char
+	if msg == "" {
+		cmsg = nil
+	} else {
+		cmsg = C.CString(msg)
+		defer C.free(unsafe.Pointer(cmsg))
+	}
 
 	ret := C.git_reference_symbolic_set_target(&ptr, v.ptr, ctarget, csig, cmsg)
 	if ret < 0 {
-		return nil, LastError()
+		return nil, MakeGitError(ret)
 	}
 
 	return newReferenceFromC(ptr), nil
@@ -60,12 +65,17 @@ func (v *Reference) SetTarget(target *Oid, sig *Signature, msg string) (*Referen
 	csig := sig.toC()
 	defer C.free(unsafe.Pointer(csig))
 
-	cmsg := C.CString(msg)
-	defer C.free(unsafe.Pointer(cmsg))
+	var cmsg *C.char
+	if msg == "" {
+		cmsg = nil
+	} else {
+		cmsg = C.CString(msg)
+		defer C.free(unsafe.Pointer(cmsg))
+	}
 
 	ret := C.git_reference_set_target(&ptr, v.ptr, target.toC(), csig, cmsg)
 	if ret < 0 {
-		return nil, LastError()
+		return nil, MakeGitError(ret)
 	}
 
 	return newReferenceFromC(ptr), nil
@@ -79,7 +89,7 @@ func (v *Reference) Resolve() (*Reference, error) {
 
 	ret := C.git_reference_resolve(&ptr, v.ptr)
 	if ret < 0 {
-		return nil, LastError()
+		return nil, MakeGitError(ret)
 	}
 
 	return newReferenceFromC(ptr), nil
@@ -93,8 +103,13 @@ func (v *Reference) Rename(name string, force bool, sig *Signature, msg string)
 	csig := sig.toC()
 	defer C.free(unsafe.Pointer(csig))
 
-	cmsg := C.CString(msg)
-	defer C.free(unsafe.Pointer(cmsg))
+	var cmsg *C.char
+	if msg == "" {
+		cmsg = nil
+	} else {
+		cmsg = C.CString(msg)
+		defer C.free(unsafe.Pointer(cmsg))
+	}
 
 	runtime.LockOSThread()
 	defer runtime.UnlockOSThread()
@@ -102,7 +117,7 @@ func (v *Reference) Rename(name string, force bool, sig *Signature, msg string)
 	ret := C.git_reference_rename(&ptr, v.ptr, cname, cbool(force), csig, cmsg)
 
 	if ret < 0 {
-		return nil, LastError()
+		return nil, MakeGitError(ret)
 	}
 
 	return newReferenceFromC(ptr), nil
@@ -128,12 +143,23 @@ func (v *Reference) Delete() error {
 	ret := C.git_reference_delete(v.ptr)
 
 	if ret < 0 {
-		return LastError()
+		return MakeGitError(ret)
 	}
 
 	return nil
 }
 
+// Cmp compares both references, retursn 0 on equality, otherwise a
+// stable sorting.
+func (v *Reference) Cmp(ref2 *Reference) int {
+	return int(C.git_reference_cmp(v.ptr, ref2.ptr))
+}
+
+// Shorthand returns a "human-readable" short reference name
+func (v *Reference) Shorthand() string {
+	return C.GoString(C.git_reference_shorthand(v.ptr))
+}
+
 func (v *Reference) Name() string {
 	return C.GoString(C.git_reference_name(v.ptr))
 }
@@ -173,7 +199,7 @@ func (repo *Repository) NewReferenceIterator() (*ReferenceIterator, error) {
 
 	ret := C.git_reference_iterator_new(&ptr, repo.ptr)
 	if ret < 0 {
-		return nil, LastError()
+		return nil, MakeGitError(ret)
 	}
 
 	iter := &ReferenceIterator{repo: repo, ptr: ptr}
@@ -194,7 +220,7 @@ func (repo *Repository) NewReferenceIteratorGlob(glob string) (*ReferenceIterato
 
 	ret := C.git_reference_iterator_glob_new(&ptr, repo.ptr, cstr)
 	if ret < 0 {
-		return nil, LastError()
+		return nil, MakeGitError(ret)
 	}
 
 	iter := &ReferenceIterator{repo: repo, ptr: ptr}
@@ -215,7 +241,7 @@ func (v *ReferenceIterator) NextName() (string, error) {
 		return "", ErrIterOver
 	}
 	if ret < 0 {
-		return "", LastError()
+		return "", MakeGitError(ret)
 	}
 
 	return C.GoString(ptr), nil
@@ -247,7 +273,7 @@ func (v *ReferenceIterator) Next() (*Reference, error) {
 		return nil, ErrIterOver
 	}
 	if ret < 0 {
-		return nil, LastError()
+		return nil, MakeGitError(ret)
 	}
 
 	return newReferenceFromC(ptr), nil
diff --git a/reference_test.go b/reference_test.go
index 156960a..ffa9f35 100644
--- a/reference_test.go
+++ b/reference_test.go
@@ -159,6 +159,33 @@ func TestIterator(t *testing.T) {
 	compareStringList(t, expected, list)
 }
 
+func TestUtil(t *testing.T) {
+	repo := createTestRepo(t)
+	defer os.RemoveAll(repo.Workdir())
+
+	commitId, _ := seedTestRepo(t, repo)
+
+	ref, err := repo.CreateReference("refs/heads/foo", commitId, true, nil, "")
+	checkFatal(t, err)
+
+	ref2, err := repo.DwimReference("foo")
+	checkFatal(t, err)
+
+	if ref.Cmp(ref2) != 0 {
+		t.Fatalf("foo didn't dwim to the right thing")
+	}
+
+	if ref.Shorthand() != "foo" {
+		t.Fatalf("refs/heads/foo has no foo shorthand")
+	}
+
+	hasLog, err := repo.HasLog("refs/heads/foo")
+	checkFatal(t, err)
+	if !hasLog {
+		t.Fatalf("branches ahve logs by default")
+	}
+}
+
 func compareStringList(t *testing.T, expected, actual []string) {
 	for i, v := range expected {
 		if actual[i] != v {
diff --git a/remote.go b/remote.go
new file mode 100644
index 0000000..eb5d7a7
--- /dev/null
+++ b/remote.go
@@ -0,0 +1,436 @@
+package git
+
+/*
+#include <git2.h>
+#include <git2/errors.h>
+
+extern void _go_git_setup_callbacks(git_remote_callbacks *callbacks);
+
+*/
+import "C"
+import "unsafe"
+import "runtime"
+
+type TransferProgress struct {
+	TotalObjects    uint
+	IndexedObjects  uint
+	ReceivedObjects uint
+	LocalObjects    uint
+	TotalDeltas     uint
+	ReceivedBytes   uint
+}
+
+func newTransferProgressFromC(c *C.git_transfer_progress) TransferProgress {
+	return TransferProgress{
+		TotalObjects:    uint(c.total_objects),
+		IndexedObjects:  uint(c.indexed_objects),
+		ReceivedObjects: uint(c.received_objects),
+		LocalObjects:    uint(c.local_objects),
+		TotalDeltas:     uint(c.total_deltas),
+		ReceivedBytes:   uint(c.received_bytes)}
+}
+
+type RemoteCompletion uint
+
+const (
+	RemoteCompletionDownload RemoteCompletion = C.GIT_REMOTE_COMPLETION_DOWNLOAD
+	RemoteCompletionIndexing                  = C.GIT_REMOTE_COMPLETION_INDEXING
+	RemoteCompletionError                     = C.GIT_REMOTE_COMPLETION_ERROR
+)
+
+type ProgressCallback func(str string) int
+type CompletionCallback func(RemoteCompletion) int
+type CredentialsCallback func(url string, username_from_url string, allowed_types CredType) (int, *Cred)
+type TransferProgressCallback func(stats TransferProgress) int
+type UpdateTipsCallback func(refname string, a *Oid, b *Oid) int
+
+type RemoteCallbacks struct {
+	ProgressCallback
+	CompletionCallback
+	CredentialsCallback
+	TransferProgressCallback
+	UpdateTipsCallback
+}
+
+type Remote struct {
+	ptr *C.git_remote
+}
+
+func populateRemoteCallbacks(ptr *C.git_remote_callbacks, callbacks *RemoteCallbacks) {
+	C.git_remote_init_callbacks(ptr, C.GIT_REMOTE_CALLBACKS_VERSION)
+	if callbacks == nil {
+		return
+	}
+	C._go_git_setup_callbacks(ptr)
+	ptr.payload = unsafe.Pointer(callbacks)
+}
+
+//export progressCallback
+func progressCallback(_str *C.char, _len C.int, data unsafe.Pointer) int {
+	callbacks := (*RemoteCallbacks)(data)
+	if callbacks.ProgressCallback == nil {
+		return 0
+	}
+	str := C.GoStringN(_str, _len)
+	return callbacks.ProgressCallback(str)
+}
+
+//export completionCallback
+func completionCallback(completion_type C.git_remote_completion_type, data unsafe.Pointer) int {
+	callbacks := (*RemoteCallbacks)(data)
+	if callbacks.CompletionCallback == nil {
+		return 0
+	}
+	return callbacks.CompletionCallback((RemoteCompletion)(completion_type))
+}
+
+//export credentialsCallback
+func credentialsCallback(_cred **C.git_cred, _url *C.char, _username_from_url *C.char, allowed_types uint, data unsafe.Pointer) int {
+	callbacks := (*RemoteCallbacks)(data)
+	if callbacks.CredentialsCallback == nil {
+		return 0
+	}
+	url := C.GoString(_url)
+	username_from_url := C.GoString(_username_from_url)
+	ret, cred := callbacks.CredentialsCallback(url, username_from_url, (CredType)(allowed_types))
+	*_cred = cred.ptr
+	return ret
+}
+
+//export transferProgressCallback
+func transferProgressCallback(stats *C.git_transfer_progress, data unsafe.Pointer) int {
+	callbacks := (*RemoteCallbacks)(data)
+	if callbacks.TransferProgressCallback == nil {
+		return 0
+	}
+	return callbacks.TransferProgressCallback(newTransferProgressFromC(stats))
+}
+
+//export updateTipsCallback
+func updateTipsCallback(_refname *C.char, _a *C.git_oid, _b *C.git_oid, data unsafe.Pointer) int {
+	callbacks := (*RemoteCallbacks)(data)
+	if callbacks.UpdateTipsCallback == nil {
+		return 0
+	}
+	refname := C.GoString(_refname)
+	a := newOidFromC(_a)
+	b := newOidFromC(_b)
+	return callbacks.UpdateTipsCallback(refname, a, b)
+}
+
+func RemoteIsValidName(name string) bool {
+	cname := C.CString(name)
+	defer C.free(unsafe.Pointer(cname))
+	if C.git_remote_is_valid_name(cname) == 1 {
+		return true
+	}
+	return false
+}
+
+func (r *Remote) Free() {
+	runtime.SetFinalizer(r, nil)
+	C.git_remote_free(r.ptr)
+}
+
+func (repo *Repository) ListRemotes() ([]string, error) {
+	var r C.git_strarray
+	ecode := C.git_remote_list(&r, repo.ptr)
+	if ecode < 0 {
+		return nil, MakeGitError(ecode)
+	}
+	defer C.git_strarray_free(&r)
+
+	remotes := makeStringsFromCStrings(r.strings, int(r.count))
+	return remotes, nil
+}
+
+func (repo *Repository) CreateRemote(name string, url string) (*Remote, error) {
+	remote := &Remote{}
+
+	cname := C.CString(name)
+	defer C.free(unsafe.Pointer(cname))
+	curl := C.CString(url)
+	defer C.free(unsafe.Pointer(curl))
+
+	runtime.LockOSThread()
+	defer runtime.UnlockOSThread()
+
+	ret := C.git_remote_create(&remote.ptr, repo.ptr, cname, curl)
+	if ret < 0 {
+		return nil, MakeGitError(ret)
+	}
+	runtime.SetFinalizer(remote, (*Remote).Free)
+	return remote, nil
+}
+
+func (repo *Repository) CreateRemoteWithFetchspec(name string, url string, fetch string) (*Remote, error) {
+	remote := &Remote{}
+
+	cname := C.CString(name)
+	defer C.free(unsafe.Pointer(cname))
+	curl := C.CString(url)
+	defer C.free(unsafe.Pointer(curl))
+	cfetch := C.CString(fetch)
+	defer C.free(unsafe.Pointer(cfetch))
+
+	runtime.LockOSThread()
+	defer runtime.UnlockOSThread()
+
+	ret := C.git_remote_create_with_fetchspec(&remote.ptr, repo.ptr, cname, curl, cfetch)
+	if ret < 0 {
+		return nil, MakeGitError(ret)
+	}
+	runtime.SetFinalizer(remote, (*Remote).Free)
+	return remote, nil
+}
+
+func (repo *Repository) CreateAnonymousRemote(url, fetch string) (*Remote, error) {
+	remote := &Remote{}
+
+	curl := C.CString(url)
+	defer C.free(unsafe.Pointer(curl))
+	cfetch := C.CString(fetch)
+	defer C.free(unsafe.Pointer(cfetch))
+
+	runtime.LockOSThread()
+	defer runtime.UnlockOSThread()
+
+	ret := C.git_remote_create_anonymous(&remote.ptr, repo.ptr, curl, cfetch)
+	if ret < 0 {
+		return nil, MakeGitError(ret)
+	}
+	runtime.SetFinalizer(remote, (*Remote).Free)
+	return remote, nil
+}
+
+func (repo *Repository) LoadRemote(name string) (*Remote, error) {
+	remote := &Remote{}
+
+	cname := C.CString(name)
+	defer C.free(unsafe.Pointer(cname))
+
+	runtime.LockOSThread()
+	defer runtime.UnlockOSThread()
+
+	ret := C.git_remote_load(&remote.ptr, repo.ptr, cname)
+	if ret < 0 {
+		return nil, MakeGitError(ret)
+	}
+	runtime.SetFinalizer(remote, (*Remote).Free)
+	return remote, nil
+}
+
+func (o *Remote) Save() error {
+
+	runtime.LockOSThread()
+	defer runtime.UnlockOSThread()
+
+	ret := C.git_remote_save(o.ptr)
+	if ret < 0 {
+		return MakeGitError(ret)
+	}
+	return nil
+}
+
+func (o *Remote) Owner() Repository {
+	return Repository{C.git_remote_owner(o.ptr)}
+}
+
+func (o *Remote) Name() string {
+	return C.GoString(C.git_remote_name(o.ptr))
+}
+
+func (o *Remote) Url() string {
+	return C.GoString(C.git_remote_url(o.ptr))
+}
+
+func (o *Remote) PushUrl() string {
+	return C.GoString(C.git_remote_pushurl(o.ptr))
+}
+
+func (o *Remote) SetUrl(url string) error {
+	curl := C.CString(url)
+	defer C.free(unsafe.Pointer(curl))
+
+	runtime.LockOSThread()
+	defer runtime.UnlockOSThread()
+
+	ret := C.git_remote_set_url(o.ptr, curl)
+	if ret < 0 {
+		return MakeGitError(ret)
+	}
+	return nil
+}
+
+func (o *Remote) SetPushUrl(url string) error {
+	curl := C.CString(url)
+	defer C.free(unsafe.Pointer(curl))
+
+	runtime.LockOSThread()
+	defer runtime.UnlockOSThread()
+
+	ret := C.git_remote_set_pushurl(o.ptr, curl)
+	if ret < 0 {
+		return MakeGitError(ret)
+	}
+	return nil
+}
+
+func (o *Remote) AddFetch(refspec string) error {
+	crefspec := C.CString(refspec)
+	defer C.free(unsafe.Pointer(crefspec))
+
+	runtime.LockOSThread()
+	defer runtime.UnlockOSThread()
+
+	ret := C.git_remote_add_fetch(o.ptr, crefspec)
+	if ret < 0 {
+		return MakeGitError(ret)
+	}
+	return nil
+}
+
+func sptr(p uintptr) *C.char {
+	return *(**C.char)(unsafe.Pointer(p))
+}
+
+func makeStringsFromCStrings(x **C.char, l int) []string {
+	s := make([]string, l)
+	i := 0
+	for p := uintptr(unsafe.Pointer(x)); i < l; p += unsafe.Sizeof(uintptr(0)) {
+		s[i] = C.GoString(sptr(p))
+		i++
+	}
+	return s
+}
+
+func makeCStringsFromStrings(s []string) **C.char {
+	l := len(s)
+	x := (**C.char)(C.malloc(C.size_t(unsafe.Sizeof(unsafe.Pointer(nil)) * uintptr(l))))
+	i := 0
+	for p := uintptr(unsafe.Pointer(x)); i < l; p += unsafe.Sizeof(uintptr(0)) {
+		*(**C.char)(unsafe.Pointer(p)) = C.CString(s[i])
+		i++
+	}
+	return x
+}
+
+func freeStrarray(arr *C.git_strarray) {
+	count := int(arr.count)
+	size := unsafe.Sizeof(unsafe.Pointer(nil))
+
+	i := 0
+	for p := uintptr(unsafe.Pointer(arr.strings)); i < count; p += size {
+		C.free(unsafe.Pointer(sptr(p)))
+		i++
+	}
+
+	C.free(unsafe.Pointer(arr.strings))
+}
+
+func (o *Remote) FetchRefspecs() ([]string, error) {
+	crefspecs := C.git_strarray{}
+
+	runtime.LockOSThread()
+	defer runtime.UnlockOSThread()
+
+	ret := C.git_remote_get_fetch_refspecs(&crefspecs, o.ptr)
+	if ret < 0 {
+		return nil, MakeGitError(ret)
+	}
+	defer C.git_strarray_free(&crefspecs)
+
+	refspecs := makeStringsFromCStrings(crefspecs.strings, int(crefspecs.count))
+	return refspecs, nil
+}
+
+func (o *Remote) SetFetchRefspecs(refspecs []string) error {
+	crefspecs := C.git_strarray{}
+	crefspecs.count = C.size_t(len(refspecs))
+	crefspecs.strings = makeCStringsFromStrings(refspecs)
+	defer freeStrarray(&crefspecs)
+
+	runtime.LockOSThread()
+	defer runtime.UnlockOSThread()
+
+	ret := C.git_remote_set_fetch_refspecs(o.ptr, &crefspecs)
+	if ret < 0 {
+		return MakeGitError(ret)
+	}
+	return nil
+}
+
+func (o *Remote) AddPush(refspec string) error {
+	crefspec := C.CString(refspec)
+	defer C.free(unsafe.Pointer(crefspec))
+
+	runtime.LockOSThread()
+	defer runtime.UnlockOSThread()
+
+	ret := C.git_remote_add_push(o.ptr, crefspec)
+	if ret < 0 {
+		return MakeGitError(ret)
+	}
+	return nil
+}
+
+func (o *Remote) PushRefspecs() ([]string, error) {
+	crefspecs := C.git_strarray{}
+
+	runtime.LockOSThread()
+	defer runtime.UnlockOSThread()
+
+	ret := C.git_remote_get_push_refspecs(&crefspecs, o.ptr)
+	if ret < 0 {
+		return nil, MakeGitError(ret)
+	}
+	defer C.git_strarray_free(&crefspecs)
+	refspecs := makeStringsFromCStrings(crefspecs.strings, int(crefspecs.count))
+	return refspecs, nil
+}
+
+func (o *Remote) SetPushRefspecs(refspecs []string) error {
+	crefspecs := C.git_strarray{}
+	crefspecs.count = C.size_t(len(refspecs))
+	crefspecs.strings = makeCStringsFromStrings(refspecs)
+	defer freeStrarray(&crefspecs)
+
+	runtime.LockOSThread()
+	defer runtime.UnlockOSThread()
+
+	ret := C.git_remote_set_push_refspecs(o.ptr, &crefspecs)
+	if ret < 0 {
+		return MakeGitError(ret)
+	}
+	return nil
+}
+
+func (o *Remote) ClearRefspecs() {
+	C.git_remote_clear_refspecs(o.ptr)
+}
+
+func (o *Remote) RefspecCount() uint {
+	return uint(C.git_remote_refspec_count(o.ptr))
+}
+
+func (o *Remote) Fetch(sig *Signature, msg string) error {
+
+	var csig *C.git_signature = nil
+	if sig != nil {
+		csig = sig.toC()
+		defer C.free(unsafe.Pointer(csig))
+	}
+
+	var cmsg *C.char
+	if msg == "" {
+		cmsg = nil
+	} else {
+		cmsg = C.CString(msg)
+		defer C.free(unsafe.Pointer(cmsg))
+	}
+	ret := C.git_remote_fetch(o.ptr, csig, cmsg)
+	if ret < 0 {
+		return MakeGitError(ret)
+	}
+	return nil
+}
diff --git a/remote_test.go b/remote_test.go
new file mode 100644
index 0000000..7cef1ec
--- /dev/null
+++ b/remote_test.go
@@ -0,0 +1,47 @@
+package git
+
+import (
+	"os"
+	"testing"
+)
+
+func TestRefspecs(t *testing.T) {
+	repo := createTestRepo(t)
+	defer os.RemoveAll(repo.Workdir())
+	defer repo.Free()
+
+	remote, err := repo.CreateAnonymousRemote("git://foo/bar", "refs/heads/*:refs/heads/*")
+	checkFatal(t, err)
+
+	expected := []string{
+		"refs/heads/*:refs/remotes/origin/*",
+		"refs/pull/*/head:refs/remotes/origin/*",
+	}
+
+	err = remote.SetFetchRefspecs(expected)
+	checkFatal(t, err)
+
+	actual, err := remote.FetchRefspecs()
+	checkFatal(t, err)
+
+	compareStringList(t, expected, actual)
+}
+
+func TestListRemotes(t *testing.T) {
+	repo := createTestRepo(t)
+	defer os.RemoveAll(repo.Workdir())
+	defer repo.Free()
+
+	_, err := repo.CreateRemote("test", "git://foo/bar")
+
+	checkFatal(t, err)
+
+	expected := []string{
+		"test",
+	}
+
+	actual, err := repo.ListRemotes()
+	checkFatal(t, err)
+
+	compareStringList(t, expected, actual)
+}
diff --git a/repository.go b/repository.go
index 1f273fb..d5aa753 100644
--- a/repository.go
+++ b/repository.go
@@ -26,7 +26,7 @@ func OpenRepository(path string) (*Repository, error) {
 
 	ret := C.git_repository_open(&repo.ptr, cpath)
 	if ret < 0 {
-		return nil, LastError()
+		return nil, MakeGitError(ret)
 	}
 
 	runtime.SetFinalizer(repo, (*Repository).Free)
@@ -44,7 +44,7 @@ func InitRepository(path string, isbare bool) (*Repository, error) {
 
 	ret := C.git_repository_init(&repo.ptr, cpath, ucbool(isbare))
 	if ret < 0 {
-		return nil, LastError()
+		return nil, MakeGitError(ret)
 	}
 
 	runtime.SetFinalizer(repo, (*Repository).Free)
@@ -80,7 +80,7 @@ func (v *Repository) Config() (*Config, error) {
 
 	ret := C.git_repository_config(&config.ptr, v.ptr)
 	if ret < 0 {
-		return nil, LastError()
+		return nil, MakeGitError(ret)
 	}
 
 	runtime.SetFinalizer(config, (*Config).Free)
@@ -95,32 +95,32 @@ func (v *Repository) Index() (*Index, error) {
 
 	ret := C.git_repository_index(&ptr, v.ptr)
 	if ret < 0 {
-		return nil, LastError()
+		return nil, MakeGitError(ret)
 	}
 
 	return newIndexFromC(ptr), nil
 }
 
-func (v *Repository) lookupType(oid *Oid, t ObjectType) (Object, error) {
+func (v *Repository) lookupType(id *Oid, t ObjectType) (Object, error) {
 	var ptr *C.git_object
 
 	runtime.LockOSThread()
 	defer runtime.UnlockOSThread()
 
-	ret := C.git_object_lookup(&ptr, v.ptr, oid.toC(), C.git_otype(t))
+	ret := C.git_object_lookup(&ptr, v.ptr, id.toC(), C.git_otype(t))
 	if ret < 0 {
-		return nil, LastError()
+		return nil, MakeGitError(ret)
 	}
 
 	return allocObject(ptr), nil
 }
 
-func (v *Repository) Lookup(oid *Oid) (Object, error) {
-	return v.lookupType(oid, ObjectAny)
+func (v *Repository) Lookup(id *Oid) (Object, error) {
+	return v.lookupType(id, ObjectAny)
 }
 
-func (v *Repository) LookupTree(oid *Oid) (*Tree, error) {
-	obj, err := v.lookupType(oid, ObjectTree)
+func (v *Repository) LookupTree(id *Oid) (*Tree, error) {
+	obj, err := v.lookupType(id, ObjectTree)
 	if err != nil {
 		return nil, err
 	}
@@ -128,8 +128,8 @@ func (v *Repository) LookupTree(oid *Oid) (*Tree, error) {
 	return obj.(*Tree), nil
 }
 
-func (v *Repository) LookupCommit(oid *Oid) (*Commit, error) {
-	obj, err := v.lookupType(oid, ObjectCommit)
+func (v *Repository) LookupCommit(id *Oid) (*Commit, error) {
+	obj, err := v.lookupType(id, ObjectCommit)
 	if err != nil {
 		return nil, err
 	}
@@ -137,8 +137,8 @@ func (v *Repository) LookupCommit(oid *Oid) (*Commit, error) {
 	return obj.(*Commit), nil
 }
 
-func (v *Repository) LookupBlob(oid *Oid) (*Blob, error) {
-	obj, err := v.lookupType(oid, ObjectBlob)
+func (v *Repository) LookupBlob(id *Oid) (*Blob, error) {
+	obj, err := v.lookupType(id, ObjectBlob)
 	if err != nil {
 		return nil, err
 	}
@@ -156,30 +156,35 @@ func (v *Repository) LookupReference(name string) (*Reference, error) {
 
 	ecode := C.git_reference_lookup(&ptr, v.ptr, cname)
 	if ecode < 0 {
-		return nil, LastError()
+		return nil, MakeGitError(ecode)
 	}
 
 	return newReferenceFromC(ptr), nil
 }
 
-func (v *Repository) CreateReference(name string, oid *Oid, force bool, sig *Signature, msg string) (*Reference, error) {
+func (v *Repository) CreateReference(name string, id *Oid, force bool, sig *Signature, msg string) (*Reference, error) {
 	cname := C.CString(name)
 	defer C.free(unsafe.Pointer(cname))
 
 	csig := sig.toC()
 	defer C.free(unsafe.Pointer(csig))
 
-	cmsg := C.CString(msg)
-	defer C.free(unsafe.Pointer(cmsg))
+	var cmsg *C.char
+	if msg == "" {
+		cmsg = nil
+	} else {
+		cmsg = C.CString(msg)
+		defer C.free(unsafe.Pointer(cmsg))
+	}
 
 	var ptr *C.git_reference
 
 	runtime.LockOSThread()
 	defer runtime.UnlockOSThread()
 
-	ecode := C.git_reference_create(&ptr, v.ptr, cname, oid.toC(), cbool(force), csig, cmsg)
+	ecode := C.git_reference_create(&ptr, v.ptr, cname, id.toC(), cbool(force), csig, cmsg)
 	if ecode < 0 {
-		return nil, LastError()
+		return nil, MakeGitError(ecode)
 	}
 
 	return newReferenceFromC(ptr), nil
@@ -195,8 +200,13 @@ func (v *Repository) CreateSymbolicReference(name, target string, force bool, si
 	csig := sig.toC()
 	defer C.free(unsafe.Pointer(csig))
 
-	cmsg := C.CString(msg)
-	defer C.free(unsafe.Pointer(cmsg))
+	var cmsg *C.char
+	if msg == "" {
+		cmsg = nil
+	} else {
+		cmsg = C.CString(msg)
+		defer C.free(unsafe.Pointer(cmsg))
+	}
 
 	var ptr *C.git_reference
 
@@ -205,26 +215,25 @@ func (v *Repository) CreateSymbolicReference(name, target string, force bool, si
 
 	ecode := C.git_reference_symbolic_create(&ptr, v.ptr, cname, ctarget, cbool(force), csig, cmsg)
 	if ecode < 0 {
-		return nil, LastError()
+		return nil, MakeGitError(ecode)
 	}
 
 	return newReferenceFromC(ptr), nil
 }
 
 func (v *Repository) Walk() (*RevWalk, error) {
-	walk := new(RevWalk)
+
+	var walkPtr *C.git_revwalk
 
 	runtime.LockOSThread()
 	defer runtime.UnlockOSThread()
 
-	ecode := C.git_revwalk_new(&walk.ptr, v.ptr)
+	ecode := C.git_revwalk_new(&walkPtr, v.ptr)
 	if ecode < 0 {
-		return nil, LastError()
+		return nil, MakeGitError(ecode)
 	}
 
-	walk.repo = v
-	runtime.SetFinalizer(walk, freeRevWalk)
-	return walk, nil
+	return revWalkFromC(v, walkPtr), nil
 }
 
 func (v *Repository) CreateCommit(
@@ -246,7 +255,7 @@ func (v *Repository) CreateCommit(
 	if nparents > 0 {
 		cparents = make([]*C.git_commit, nparents)
 		for i, v := range parents {
-			cparents[i] = v.ptr
+			cparents[i] = v.cast_ptr
 		}
 		parentsarg = &cparents[0]
 	}
@@ -263,10 +272,10 @@ func (v *Repository) CreateCommit(
 	ret := C.git_commit_create(
 		oid.toC(), v.ptr, cref,
 		authorSig, committerSig,
-		nil, cmsg, tree.ptr, C.size_t(nparents), parentsarg)
+		nil, cmsg, tree.cast_ptr, C.size_t(nparents), parentsarg)
 
 	if ret < 0 {
-		return nil, LastError()
+		return nil, MakeGitError(ret)
 	}
 
 	return oid, nil
@@ -289,7 +298,7 @@ func (v *Repository) Odb() (odb *Odb, err error) {
 	defer runtime.UnlockOSThread()
 
 	if ret := C.git_repository_odb(&odb.ptr, v.ptr); ret < 0 {
-		return nil, LastError()
+		return nil, MakeGitError(ret)
 	}
 
 	runtime.SetFinalizer(odb, (*Odb).Free)
@@ -315,9 +324,10 @@ func (repo *Repository) SetWorkdir(workdir string, updateGitlink bool) error {
 	runtime.LockOSThread()
 	defer runtime.UnlockOSThread()
 
-	if C.git_repository_set_workdir(repo.ptr, cstr, cbool(updateGitlink)) < 0 {
-		return LastError()
+	if ret := C.git_repository_set_workdir(repo.ptr, cstr, cbool(updateGitlink)); ret < 0 {
+		return MakeGitError(ret)
 	}
+
 	return nil
 }
 
@@ -328,7 +338,22 @@ func (v *Repository) TreeBuilder() (*TreeBuilder, error) {
 	defer runtime.UnlockOSThread()
 
 	if ret := C.git_treebuilder_create(&bld.ptr, nil); ret < 0 {
-		return nil, LastError()
+		return nil, MakeGitError(ret)
+	}
+	runtime.SetFinalizer(bld, (*TreeBuilder).Free)
+
+	bld.repo = v
+	return bld, nil
+}
+
+func (v *Repository) TreeBuilderFromTree(tree *Tree) (*TreeBuilder, error) {
+	bld := new(TreeBuilder)
+
+	runtime.LockOSThread()
+	defer runtime.UnlockOSThread()
+
+	if ret := C.git_treebuilder_create(&bld.ptr, tree.cast_ptr); ret < 0 {
+		return nil, MakeGitError(ret)
 	}
 	runtime.SetFinalizer(bld, (*TreeBuilder).Free)
 
@@ -347,8 +372,57 @@ func (v *Repository) RevparseSingle(spec string) (Object, error) {
 
 	ecode := C.git_revparse_single(&ptr, v.ptr, cspec)
 	if ecode < 0 {
-		return nil, LastError()
+		return nil, MakeGitError(ecode)
 	}
 
 	return allocObject(ptr), nil
 }
+
+// EnsureLog ensures that there is a reflog for the given reference
+// name and creates an empty one if necessary.
+func (v *Repository) EnsureLog(name string) error {
+	cname := C.CString(name)
+	defer C.free(unsafe.Pointer(cname))
+
+	runtime.LockOSThread()
+	defer runtime.UnlockOSThread()
+
+	if ret := C.git_reference_ensure_log(v.ptr, cname); ret < 0 {
+		return MakeGitError(ret)
+	}
+
+	return nil
+}
+
+// HasLog returns whether there is a reflog for the given reference
+// name
+func (v *Repository) HasLog(name string) (bool, error) {
+	cname := C.CString(name)
+	defer C.free(unsafe.Pointer(cname))
+
+	runtime.LockOSThread()
+	defer runtime.UnlockOSThread()
+
+	ret := C.git_reference_has_log(v.ptr, cname)
+	if ret < 0 {
+		return false, MakeGitError(ret)
+	}
+
+	return ret == 1, nil
+}
+
+// DwimReference looks up a reference by DWIMing its short name
+func (v *Repository) DwimReference(name string) (*Reference, error) {
+	cname := C.CString(name)
+	defer C.free(unsafe.Pointer(cname))
+
+	runtime.LockOSThread()
+	defer runtime.UnlockOSThread()
+
+	var ptr *C.git_reference
+	if ret := C.git_reference_dwim(&ptr, v.ptr, cname); ret < 0 {
+		return nil, MakeGitError(ret)
+	}
+
+	return newReferenceFromC(ptr), nil
+}
diff --git a/script/build-libgit2.sh b/script/build-libgit2.sh
new file mode 100755
index 0000000..8376a15
--- /dev/null
+++ b/script/build-libgit2.sh
@@ -0,0 +1,13 @@
+#!/bin/sh
+
+set -ex
+
+git clone --depth 1 --single-branch git://github.com/libgit2/libgit2 libgit2
+
+cd libgit2
+cmake -DTHREADSAFE=ON \
+      -DBUILD_CLAR=OFF \
+      -DCMAKE_INSTALL_PREFIX=$PWD/install \
+      .
+
+make install
diff --git a/settings/settings.go b/settings/settings.go
new file mode 100644
index 0000000..6661c5d
--- /dev/null
+++ b/settings/settings.go
@@ -0,0 +1,109 @@
+package settings
+
+/*
+#cgo pkg-config: libgit2
+#include <git2.h>
+
+int _go_git_opts_get_search_path(int level, git_buf *buf)
+{
+    return git_libgit2_opts(GIT_OPT_GET_SEARCH_PATH, level, buf);
+}
+
+int _go_git_opts_set_search_path(int level, const char *path)
+{
+    return git_libgit2_opts(GIT_OPT_SET_SEARCH_PATH, level, path);
+}
+
+int _go_git_opts_set_size_t(int opt, size_t val)
+{
+    return git_libgit2_opts(opt, val);
+}
+
+int _go_git_opts_get_size_t(int opt, size_t *val)
+{
+    return git_libgit2_opts(opt, val);
+}
+
+*/
+import "C"
+import (
+	"runtime"
+	"unsafe"
+	"github.com/libgit2/git2go"
+)
+
+func MakeGitError(err C.int) error {
+	return git.MakeGitError2(int(err))
+}
+
+func SearchPath(level git.ConfigLevel) (string, error) {
+	var buf C.git_buf
+	defer C.git_buf_free(&buf)
+
+	runtime.LockOSThread()
+	defer runtime.UnlockOSThread()
+
+	err := C._go_git_opts_get_search_path(C.int(level), &buf)
+	if err < 0 {
+		return "", MakeGitError(err)
+	}
+
+	return C.GoString(buf.ptr), nil
+}
+
+func SetSearchPath(level git.ConfigLevel, path string) error {
+	cpath := C.CString(path)
+	defer C.free(unsafe.Pointer(cpath))
+
+	runtime.LockOSThread()
+	defer runtime.UnlockOSThread()
+
+	err := C._go_git_opts_set_search_path(C.int(level), cpath)
+	if err < 0 {
+		return MakeGitError(err)
+	}
+
+	return nil
+}
+
+func getSizet(opt C.int) (int, error) {
+	runtime.LockOSThread()
+	defer runtime.UnlockOSThread()
+
+	var val C.size_t
+	err := C._go_git_opts_get_size_t(opt, &val);
+	if err < 0 {
+		return 0, MakeGitError(err)
+	}
+
+	return int(val), nil
+}
+
+func setSizet(opt C.int, val int) error {
+	runtime.LockOSThread()
+	defer runtime.UnlockOSThread()
+
+	cval := C.size_t(val)
+	err := C._go_git_opts_set_size_t(opt, cval);
+	if err < 0 {
+		return MakeGitError(err)
+	}
+
+	return nil
+}
+
+func MwindowSize() (int, error) {
+	return getSizet(C.GIT_OPT_GET_MWINDOW_SIZE)
+}
+
+func SetMwindowSize(size int) error {
+	return setSizet(C.GIT_OPT_SET_MWINDOW_SIZE, size)
+}
+
+func MwindowMappedLimit() (int, error) {
+	return getSizet(C.GIT_OPT_GET_MWINDOW_MAPPED_LIMIT)
+}
+
+func SetMwindowMappedLimit(size int) error {
+	return setSizet(C.GIT_OPT_SET_MWINDOW_MAPPED_LIMIT, size)
+}
diff --git a/settings/settings_test.go b/settings/settings_test.go
new file mode 100644
index 0000000..55b08c8
--- /dev/null
+++ b/settings/settings_test.go
@@ -0,0 +1,66 @@
+package settings
+
+import (
+	"testing"
+	"runtime"
+	"github.com/libgit2/git2go"
+)
+
+type pathPair struct {
+	Level git.ConfigLevel
+	Path  string
+}
+
+func TestSearchPath(t *testing.T) {
+	paths := []pathPair{
+		pathPair{git.ConfigLevelSystem, "/tmp/system"},
+		pathPair{git.ConfigLevelGlobal, "/tmp/global"},
+		pathPair{git.ConfigLevelXDG, "/tmp/xdg"},
+	}
+
+	for _, pair := range paths {
+		err := SetSearchPath(pair.Level, pair.Path)
+		checkFatal(t, err)
+
+		actual, err := SearchPath(pair.Level)
+		checkFatal(t, err)
+
+		if pair.Path != actual {
+			t.Fatal("Search paths don't match")
+		}
+	}
+}
+
+func TestMmapSizes(t *testing.T) {
+	size := 42 * 1024
+
+	err := SetMwindowSize(size)
+	checkFatal(t, err)
+
+	actual, err := MwindowSize()
+	if size != actual {
+		t.Fatal("Sizes don't match")
+	}
+
+	err = SetMwindowMappedLimit(size)
+	checkFatal(t, err)
+
+	actual, err = MwindowMappedLimit()
+	if size != actual {
+		t.Fatal("Sizes don't match")
+	}
+}
+
+func checkFatal(t *testing.T, err error) {
+	if err == nil {
+		return
+	}
+
+	// The failure happens at wherever we were called, not here
+	_, file, line, ok := runtime.Caller(1)
+	if !ok {
+		t.Fatal()
+	}
+
+	t.Fatalf("Fail at %v:%v; %v", file, line, err)
+}
diff --git a/submodule.go b/submodule.go
index 9abf333..f6ab5e1 100644
--- a/submodule.go
+++ b/submodule.go
@@ -81,7 +81,7 @@ func (repo *Repository) LookupSubmodule(name string) (*Submodule, error) {
 
 	ret := C.git_submodule_lookup(&sub.ptr, repo.ptr, cname)
 	if ret < 0 {
-		return nil, LastError()
+		return nil, MakeGitError(ret)
 	}
 
 	return sub, nil
@@ -102,7 +102,7 @@ func (repo *Repository) ForeachSubmodule(cbk SubmoduleCbk) error {
 
 	ret := C._go_git_visit_submodule(repo.ptr, unsafe.Pointer(&cbk))
 	if ret < 0 {
-		return LastError()
+		return MakeGitError(ret)
 	}
 	return nil
 }
@@ -120,7 +120,7 @@ func (repo *Repository) AddSubmodule(url, path string, use_git_link bool) (*Subm
 
 	ret := C.git_submodule_add_setup(&sub.ptr, repo.ptr, curl, cpath, cbool(use_git_link))
 	if ret < 0 {
-		return nil, LastError()
+		return nil, MakeGitError(ret)
 	}
 	return sub, nil
 }
@@ -131,7 +131,7 @@ func (sub *Submodule) FinalizeAdd() error {
 
 	ret := C.git_submodule_add_finalize(sub.ptr)
 	if ret < 0 {
-		return LastError()
+		return MakeGitError(ret)
 	}
 	return nil
 }
@@ -142,7 +142,7 @@ func (sub *Submodule) AddToIndex(write_index bool) error {
 
 	ret := C.git_submodule_add_to_index(sub.ptr, cbool(write_index))
 	if ret < 0 {
-		return LastError()
+		return MakeGitError(ret)
 	}
 	return nil
 }
@@ -153,7 +153,7 @@ func (sub *Submodule) Save() error {
 
 	ret := C.git_submodule_save(sub.ptr)
 	if ret < 0 {
-		return LastError()
+		return MakeGitError(ret)
 	}
 	return nil
 }
@@ -188,7 +188,7 @@ func (sub *Submodule) SetUrl(url string) error {
 
 	ret := C.git_submodule_set_url(sub.ptr, curl)
 	if ret < 0 {
-		return LastError()
+		return MakeGitError(ret)
 	}
 	return nil
 }
@@ -238,7 +238,7 @@ func (sub *Submodule) SetUpdate(update SubmoduleUpdate) SubmoduleUpdate {
 }
 
 func (sub *Submodule) FetchRecurseSubmodules() SubmoduleRecurse {
-	return SubmoduleRecurse(C.git_submodule_fetch_recurse_submodules(sub.ptr));
+	return SubmoduleRecurse(C.git_submodule_fetch_recurse_submodules(sub.ptr))
 }
 
 func (sub *Submodule) SetFetchRecurseSubmodules(recurse SubmoduleRecurse) error {
@@ -247,7 +247,7 @@ func (sub *Submodule) SetFetchRecurseSubmodules(recurse SubmoduleRecurse) error
 
 	ret := C.git_submodule_set_fetch_recurse_submodules(sub.ptr, C.git_submodule_recurse_t(recurse))
 	if ret < 0 {
-		return LastError()
+		return MakeGitError(C.int(ret))
 	}
 	return nil
 }
@@ -258,7 +258,7 @@ func (sub *Submodule) Init(overwrite bool) error {
 
 	ret := C.git_submodule_init(sub.ptr, cbool(overwrite))
 	if ret < 0 {
-		return LastError()
+		return MakeGitError(ret)
 	}
 	return nil
 }
@@ -269,7 +269,7 @@ func (sub *Submodule) Sync() error {
 
 	ret := C.git_submodule_sync(sub.ptr)
 	if ret < 0 {
-		return LastError()
+		return MakeGitError(ret)
 	}
 	return nil
 }
@@ -282,29 +282,29 @@ func (sub *Submodule) Open() (*Repository, error) {
 
 	ret := C.git_submodule_open(&repo.ptr, sub.ptr)
 	if ret < 0 {
-		return nil, LastError()
+		return nil, MakeGitError(ret)
 	}
 	return repo, nil
 }
 
-func (sub *Submodule) Reload() error {
+func (sub *Submodule) Reload(force bool) error {
 	runtime.LockOSThread()
 	defer runtime.UnlockOSThread()
 
-	ret := C.git_submodule_reload(sub.ptr)
+	ret := C.git_submodule_reload(sub.ptr, cbool(force))
 	if ret < 0 {
-		return LastError()
+		return MakeGitError(ret)
 	}
 	return nil
 }
 
-func (repo *Repository) ReloadAllSubmodules() error {
+func (repo *Repository) ReloadAllSubmodules(force bool) error {
 	runtime.LockOSThread()
 	defer runtime.UnlockOSThread()
 
-	ret := C.git_submodule_reload_all(repo.ptr)
+	ret := C.git_submodule_reload_all(repo.ptr, cbool(force))
 	if ret < 0 {
-		return LastError()
+		return MakeGitError(ret)
 	}
 	return nil
 }
diff --git a/tree.go b/tree.go
index 8c74e5d..8356fba 100644
--- a/tree.go
+++ b/tree.go
@@ -14,23 +14,25 @@ import (
 )
 
 type Filemode int
+
 const (
-	FilemodeNew   Filemode = C.GIT_FILEMODE_NEW
-	FilemodeTree           = C.GIT_FILEMODE_TREE
-	FilemodeBlob           = C.GIT_FILEMODE_BLOB
-	FilemodeBlobExecutable = C.GIT_FILEMODE_BLOB_EXECUTABLE
-	FilemodeLink           = C.GIT_FILEMODE_LINK
-	FilemodeCommit         = C.GIT_FILEMODE_COMMIT
+	FilemodeNew            Filemode = C.GIT_FILEMODE_NEW
+	FilemodeTree                    = C.GIT_FILEMODE_TREE
+	FilemodeBlob                    = C.GIT_FILEMODE_BLOB
+	FilemodeBlobExecutable          = C.GIT_FILEMODE_BLOB_EXECUTABLE
+	FilemodeLink                    = C.GIT_FILEMODE_LINK
+	FilemodeCommit                  = C.GIT_FILEMODE_COMMIT
 )
 
 type Tree struct {
 	gitObject
+	cast_ptr *C.git_tree
 }
 
 type TreeEntry struct {
-	Name string
-	Id  *Oid
-	Type ObjectType
+	Name     string
+	Id       *Oid
+	Type     ObjectType
 	Filemode int
 }
 
@@ -47,7 +49,7 @@ func (t Tree) EntryByName(filename string) *TreeEntry {
 	cname := C.CString(filename)
 	defer C.free(unsafe.Pointer(cname))
 
-	entry := C.git_tree_entry_byname(t.ptr, cname)
+	entry := C.git_tree_entry_byname(t.cast_ptr, cname)
 	if entry == nil {
 		return nil
 	}
@@ -65,16 +67,16 @@ func (t Tree) EntryByPath(path string) (*TreeEntry, error) {
 	runtime.LockOSThread()
 	defer runtime.UnlockOSThread()
 
-	ret := C.git_tree_entry_bypath(&entry, t.ptr, cpath)
+	ret := C.git_tree_entry_bypath(&entry, t.cast_ptr, cpath)
 	if ret < 0 {
-		return nil, LastError()
+		return nil, MakeGitError(ret)
 	}
 
 	return newTreeEntry(entry), nil
 }
 
 func (t Tree) EntryByIndex(index uint64) *TreeEntry {
-	entry := C.git_tree_entry_byindex(t.ptr, C.size_t(index))
+	entry := C.git_tree_entry_byindex(t.cast_ptr, C.size_t(index))
 	if entry == nil {
 		return nil
 	}
@@ -83,7 +85,7 @@ func (t Tree) EntryByIndex(index uint64) *TreeEntry {
 }
 
 func (t Tree) EntryCount() uint64 {
-	num := C.git_tree_entrycount(t.ptr)
+	num := C.git_tree_entrycount(t.cast_ptr)
 	return uint64(num)
 }
 
@@ -103,20 +105,20 @@ func (t Tree) Walk(callback TreeWalkCallback) error {
 	defer runtime.UnlockOSThread()
 
 	err := C._go_git_treewalk(
-		t.ptr,
+		t.cast_ptr,
 		C.GIT_TREEWALK_PRE,
 		unsafe.Pointer(&callback),
 	)
 
 	if err < 0 {
-		return LastError()
+		return MakeGitError(err)
 	}
 
 	return nil
 }
 
 type TreeBuilder struct {
-	ptr *C.git_treebuilder
+	ptr  *C.git_treebuilder
 	repo *Repository
 }
 
@@ -125,7 +127,7 @@ func (v *TreeBuilder) Free() {
 	C.git_treebuilder_free(v.ptr)
 }
 
-func (v *TreeBuilder) Insert(filename string, id *Oid, filemode int) (error) {
+func (v *TreeBuilder) Insert(filename string, id *Oid, filemode int) error {
 	cfilename := C.CString(filename)
 	defer C.free(unsafe.Pointer(cfilename))
 
@@ -134,7 +136,22 @@ func (v *TreeBuilder) Insert(filename string, id *Oid, filemode int) (error) {
 
 	err := C.git_treebuilder_insert(nil, v.ptr, cfilename, id.toC(), C.git_filemode_t(filemode))
 	if err < 0 {
-		return LastError()
+		return MakeGitError(err)
+	}
+
+	return nil
+}
+
+func (v *TreeBuilder) Remove(filename string) error {
+	cfilename := C.CString(filename)
+	defer C.free(unsafe.Pointer(cfilename))
+
+	runtime.LockOSThread()
+	defer runtime.UnlockOSThread()
+
+	err := C.git_treebuilder_remove(v.ptr, cfilename)
+	if err < 0 {
+		return MakeGitError(err)
 	}
 
 	return nil
@@ -149,7 +166,7 @@ func (v *TreeBuilder) Write() (*Oid, error) {
 	err := C.git_treebuilder_write(oid.toC(), v.repo.ptr, v.ptr)
 
 	if err < 0 {
-		return nil, LastError()
+		return nil, MakeGitError(err)
 	}
 
 	return oid, nil
diff --git a/walk.go b/walk.go
index 6979b6b..f7c147d 100644
--- a/walk.go
+++ b/walk.go
@@ -9,16 +9,18 @@ import "C"
 import (
 	"io"
 	"runtime"
+	"unsafe"
 )
 
 // RevWalk
 
 type SortType uint
+
 const (
-	SortNone SortType = C.GIT_SORT_NONE
-	SortTopological   = C.GIT_SORT_TOPOLOGICAL
-	SortTime          = C.GIT_SORT_TIME
-	SortReverse       = C.GIT_SORT_REVERSE
+	SortNone        SortType = C.GIT_SORT_NONE
+	SortTopological          = C.GIT_SORT_TOPOLOGICAL
+	SortTime                 = C.GIT_SORT_TIME
+	SortReverse              = C.GIT_SORT_REVERSE
 )
 
 type RevWalk struct {
@@ -26,12 +28,67 @@ type RevWalk struct {
 	repo *Repository
 }
 
+func revWalkFromC(repo *Repository, c *C.git_revwalk) *RevWalk {
+	v := &RevWalk{ptr: c, repo: repo}
+	runtime.SetFinalizer(v, (*RevWalk).Free)
+	return v
+}
+
 func (v *RevWalk) Reset() {
 	C.git_revwalk_reset(v.ptr)
 }
 
-func (v *RevWalk) Push(id *Oid) {
-	C.git_revwalk_push(v.ptr, id.toC())
+func (v *RevWalk) Push(id *Oid) error {
+	runtime.LockOSThread()
+	defer runtime.UnlockOSThread()
+
+	ecode := C.git_revwalk_push(v.ptr, id.toC())
+	if ecode < 0 {
+		return MakeGitError(ecode)
+	}
+	return nil
+}
+
+func (v *RevWalk) PushGlob(glob string) error {
+	runtime.LockOSThread()
+	defer runtime.UnlockOSThread()
+
+	cstr := C.CString(glob)
+	defer C.free(unsafe.Pointer(cstr))
+
+	ecode := C.git_revwalk_push_glob(v.ptr, cstr)
+	if ecode < 0 {
+		return MakeGitError(ecode)
+	}
+	return nil
+}
+
+func (v *RevWalk) PushRange(r string) error {
+	runtime.LockOSThread()
+	defer runtime.UnlockOSThread()
+
+	cstr := C.CString(r)
+	defer C.free(unsafe.Pointer(cstr))
+
+	ecode := C.git_revwalk_push_range(v.ptr, cstr)
+	if ecode < 0 {
+		return MakeGitError(ecode)
+	}
+	return nil
+}
+
+func (v *RevWalk) PushRef(r string) error {
+	runtime.LockOSThread()
+	defer runtime.UnlockOSThread()
+
+	cstr := C.CString(r)
+	defer C.free(unsafe.Pointer(cstr))
+
+	ecode := C.git_revwalk_push_ref(v.ptr, cstr)
+	if ecode < 0 {
+		return MakeGitError(ecode)
+	}
+	return nil
 }
 
 func (v *RevWalk) PushHead() (err error) {
@@ -40,22 +97,71 @@ func (v *RevWalk) PushHead() (err error) {
 
 	ecode := C.git_revwalk_push_head(v.ptr)
 	if ecode < 0 {
-		err = LastError()
+		err = MakeGitError(ecode)
 	}
+	return nil
+}
 
-	return
+func (v *RevWalk) Hide(id *Oid) error {
+	runtime.LockOSThread()
+	defer runtime.UnlockOSThread()
+
+	ecode := C.git_revwalk_hide(v.ptr, id.toC())
+	if ecode < 0 {
+		return MakeGitError(ecode)
+	}
+	return nil
+}
+
+func (v *RevWalk) HideGlob(glob string) error {
+	runtime.LockOSThread()
+	defer runtime.UnlockOSThread()
+
+	cstr := C.CString(glob)
+	defer C.free(unsafe.Pointer(cstr))
+
+	ecode := C.git_revwalk_hide_glob(v.ptr, cstr)
+	if ecode < 0 {
+		return MakeGitError(ecode)
+	}
+	return nil
 }
 
-func (v *RevWalk) Next(oid *Oid) (err error) {
+func (v *RevWalk) HideRef(r string) error {
 	runtime.LockOSThread()
 	defer runtime.UnlockOSThread()
 
-	ret := C.git_revwalk_next(oid.toC(), v.ptr)
+	cstr := C.CString(r)
+	defer C.free(unsafe.Pointer(cstr))
+
+	ecode := C.git_revwalk_hide_ref(v.ptr, cstr)
+	if ecode < 0 {
+		return MakeGitError(ecode)
+	}
+	return nil
+}
+
+func (v *RevWalk) HideHead() (err error) {
+	runtime.LockOSThread()
+	defer runtime.UnlockOSThread()
+
+	ecode := C.git_revwalk_hide_head(v.ptr)
+	if ecode < 0 {
+		err = MakeGitError(ecode)
+	}
+	return nil
+}
+
+func (v *RevWalk) Next(id *Oid) (err error) {
+	runtime.LockOSThread()
+	defer runtime.UnlockOSThread()
+
+	ret := C.git_revwalk_next(id.toC(), v.ptr)
 	switch {
 	case ret == ITEROVER:
 		err = io.EOF
 	case ret < 0:
-		err = LastError()
+		err = MakeGitError(ret)
 	}
 
 	return
@@ -92,6 +198,8 @@ func (v *RevWalk) Sorting(sm SortType) {
 	C.git_revwalk_sorting(v.ptr, C.uint(sm))
 }
 
-func freeRevWalk(walk *RevWalk) {
-	C.git_revwalk_free(walk.ptr)
+func (v *RevWalk) Free() {
+
+	runtime.SetFinalizer(v, nil)
+	C.git_revwalk_free(v.ptr)
 }
diff --git a/wrapper.c b/wrapper.c
index 66a6110..f2232e4 100644
--- a/wrapper.c
+++ b/wrapper.c
@@ -42,4 +42,42 @@ void _go_git_refdb_backend_free(git_refdb_backend *backend)
 
     return;
 }
+
+void _go_git_setup_callbacks(git_remote_callbacks *callbacks) {
+	typedef int (*progress_cb)(const char *str, int len, void *data);
+	typedef int (*completion_cb)(git_remote_completion_type type, void *data);
+	typedef int (*credentials_cb)(git_cred **cred, const char *url, const char *username_from_url, unsigned int allowed_types,	void *data);
+	typedef int (*transfer_progress_cb)(const git_transfer_progress *stats, void *data);
+	typedef int (*update_tips_cb)(const char *refname, const git_oid *a, const git_oid *b, void *data);
+	callbacks->progress = (progress_cb)progressCallback;
+	callbacks->completion = (completion_cb)completionCallback;
+	callbacks->credentials = (credentials_cb)credentialsCallback;
+	callbacks->transfer_progress = (transfer_progress_cb)transferProgressCallback;
+	callbacks->update_tips = (update_tips_cb)updateTipsCallback;
+}
+
+typedef int (*status_foreach_cb)(const char *ref, const char *msg, void *data);
+
+int _go_git_push_status_foreach(git_push *push, void *data)
+{
+	return git_push_status_foreach(push, (status_foreach_cb)statusForeach, data);
+}
+
+int _go_git_push_set_callbacks(git_push *push, void *packbuilder_progress_data, void *transfer_progress_data)
+{
+	return git_push_set_callbacks(push, packbuilderProgress, packbuilder_progress_data, pushTransferProgress, transfer_progress_data);
+}
+
+int _go_blob_chunk_cb(char *buffer, size_t maxLen, void *payload)
+{
+    return blobChunkCb(buffer, maxLen, payload);
+}
+
+int _go_git_blob_create_fromchunks(git_oid *id,
+	git_repository *repo,
+	const char *hintpath,
+	void *payload)
+{
+    return git_blob_create_fromchunks(id, repo, hintpath, _go_blob_chunk_cb, payload);
+}
 /* EOF */